mirror of
https://github.com/kuhyx/testsAndMisc.git
synced 2026-07-04 13:03:13 +02:00
Krzysztof kuhy Rudnicki
42a66a1419
- Move all linux_configuration scripts into two semantic categories: - single_use/: scripts run once manually (fresh install, fixes, setup) - periodic_background/: scripts run by systemd timers or daemons - Preserve existing subdirectory structure within each category - Fix lib/common.sh source paths for new directory depths - Fix CONFIG_DIR depth in setup_periodic_system.sh and check_and_enable_services.sh - Update all references in tests, fresh-install/main.sh, nix modules, and docs - Fix check_polling_antipatterns.sh false positives (||, regex |, case patterns, jq strings) - Fix pre-existing mypy exclusion path and type annotations for moved tools/ directory - Rewrite check_polling_antipatterns.sh using awk (no bash regex loops); add require_serial: true
624 lines
19 KiB
Bash
Executable File
624 lines
19 KiB
Bash
Executable File
#!/usr/bin/env bash
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# Optimize Arch Linux desktop for maximum performance on high-end hardware
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#
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# Tuning areas:
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# 1. CPU scheduler — performance governor on all cores
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# 2. I/O scheduler — optimal scheduler per drive type (none for NVMe, mq-deadline for SATA SSD)
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# 3. Memory / swap — lower swappiness, tune dirty page writeback for responsiveness
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# 4. Kernel network — TCP BBR, fastopen, larger buffers
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# 5. Filesystem — fstrim timer, noatime advisory
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# 6. NVIDIA GPU — max performance level via persistence mode
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# 7. Kernel mitigations — option to disable CPU vulnerability mitigations for extra speed
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# 8. Boot speed — disable unnecessary wait-online services
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# 9. Journal housekeeping — cap at 300M
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# 10. Process scheduler — install ananicy-cpp for automatic nice/ionice/scheduling
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#
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# Usage:
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# ./optimize_arch_desktop.sh # Apply safe optimizations
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# ./optimize_arch_desktop.sh --dry-run # Show what would be done
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# ./optimize_arch_desktop.sh --interactive # Prompt before each tweak
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# ./optimize_arch_desktop.sh --aggressive # Include CPU mitigation disable (risk: security)
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# ./optimize_arch_desktop.sh -h # Show help
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#
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# All tweaks are idempotent and safe to re-run.
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# Some kernel parameter changes require a reboot to take full effect.
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set -euo pipefail
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SCRIPT_DIR="$(dirname "$(readlink -f "$0")")"
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# shellcheck source=../../lib/common.sh
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source "$SCRIPT_DIR/../../lib/common.sh"
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parse_interactive_args "$@"
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shift "$COMMON_ARGS_SHIFT"
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DRY_RUN=false
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AGGRESSIVE=false
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for arg in "$@"; do
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case "$arg" in
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--dry-run)
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DRY_RUN=true
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;;
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--aggressive)
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AGGRESSIVE=true
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;;
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-h | --help)
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cat <<'EOF'
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optimize_arch_desktop.sh - Squeeze maximum performance from an Arch Linux desktop
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Usage: optimize_arch_desktop.sh [OPTIONS]
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Options:
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--dry-run Show what would be done without making changes
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--aggressive Also disable CPU vulnerability mitigations (trades security for speed)
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-i, --interactive Prompt before each optimization
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-h, --help Show this help message
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Optimizations applied:
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1. Set CPU governor to performance on all cores
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2. Set optimal I/O scheduler per drive (none/mq-deadline)
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3. Tune vm.swappiness, dirty ratios, vfs_cache_pressure via sysctl
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4. Enable TCP BBR congestion control + fastopen + buffer tuning
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5. Enable fstrim.timer for SSD TRIM maintenance
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6. Set NVIDIA GPU to max performance level (persistence mode)
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7. [--aggressive] Disable CPU vulnerability mitigations
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8. Disable NetworkManager-wait-online.service for faster boot
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9. Vacuum & cap systemd journal at 300M
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10. Install/enable ananicy-cpp for automatic process prioritization
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All optimizations are idempotent. Re-run safely at any time.
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EOF
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exit 0
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;;
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esac
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done
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require_root "$@"
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print_setup_header "Arch Linux Desktop Performance Optimizer"
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TWEAKS_APPLIED=0
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TWEAKS_SKIPPED=0
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# ---------------------------------------------------------------------------
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# Helper: apply or preview a tweak
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# ---------------------------------------------------------------------------
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apply_tweak() {
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local description="$1"
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shift
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echo ""
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log_info "$description"
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if [[ $DRY_RUN == "true" ]]; then
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echo " [dry-run] Would run: $*"
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return 0
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fi
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if [[ $INTERACTIVE_MODE == "true" ]]; then
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if ! ask_yes_no " Apply this optimization?"; then
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log_warn "Skipped."
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((TWEAKS_SKIPPED++)) || true
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return 0
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fi
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fi
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if "$@"; then
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log_ok "Done."
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((TWEAKS_APPLIED++)) || true
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else
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log_error "Failed (non-fatal, continuing)."
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fi
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}
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# ===================================================================
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# 1. CPU Governor → performance
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# ===================================================================
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tweak_cpu_governor() {
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local gov_files
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gov_files=$(find /sys/devices/system/cpu -maxdepth 3 -name scaling_governor 2>/dev/null || true)
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if [[ -z $gov_files ]]; then
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log_warn "No CPU governor sysfs files found — skipping."
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return 0
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fi
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# Check current state
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local all_performance=true
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local f
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for f in $gov_files; do
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if [[ $(cat "$f") != "performance" ]]; then
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all_performance=false
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break
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fi
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done
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if [[ $all_performance == "true" ]]; then
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log_ok "All CPU cores already on 'performance' governor — skipping."
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return 0
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fi
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for f in $gov_files; do
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echo "performance" >"$f"
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done
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# Make it persistent via a sysctl-style drop-in using udev rule
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local udev_rule="/etc/udev/rules.d/60-cpu-governor-performance.rules"
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if [[ ! -f $udev_rule ]]; then
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cat >"$udev_rule" <<'UDEVEOF'
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# Set CPU governor to performance on all cores at boot
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SUBSYSTEM=="module", DEVPATH=="*/cpu/*", ATTR{scaling_governor}=="*", ATTR{scaling_governor}="performance"
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UDEVEOF
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fi
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# Also install cpupower hook as a more reliable persistence method
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local cpupower_conf="/etc/default/cpupower"
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if has_cmd cpupower; then
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if [[ ! -f $cpupower_conf ]] || ! grep -q "^governor='performance'" "$cpupower_conf" 2>/dev/null; then
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mkdir -p "$(dirname "$cpupower_conf")"
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cat >"$cpupower_conf" <<'CPUEOF'
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# /etc/default/cpupower — managed by optimize_arch_desktop.sh
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governor='performance'
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CPUEOF
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systemctl enable cpupower.service 2>/dev/null || true
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fi
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fi
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return 0
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}
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# ===================================================================
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# 2. I/O Scheduler per drive type
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# ===================================================================
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tweak_io_scheduler() {
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local changed=false
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local block_dev
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for block_dev in /sys/block/sd* /sys/block/nvme* /sys/block/vd*; do
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[[ -d $block_dev ]] || continue
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local sched_file="$block_dev/queue/scheduler"
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[[ -f $sched_file ]] || continue
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local dev_name
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dev_name=$(basename "$block_dev")
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local rotational
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rotational=$(cat "$block_dev/queue/rotational" 2>/dev/null || echo 1)
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local current
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current=$(sed 's/.*\[\(.*\)\].*/\1/' "$sched_file" 2>/dev/null || true)
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local target
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if [[ $dev_name == nvme* ]]; then
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target="none"
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elif [[ $rotational -eq 0 ]]; then
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target="mq-deadline"
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else
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target="bfq"
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fi
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if [[ $current == "$target" ]]; then
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log_ok "$dev_name: already using '$target' scheduler."
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continue
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fi
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echo "$target" >"$sched_file" 2>/dev/null || true
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log_info "$dev_name: scheduler changed from '$current' to '$target'."
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changed=true
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done
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# Persist via udev rule
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local udev_rule="/etc/udev/rules.d/60-io-scheduler.rules"
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if [[ ! -f $udev_rule ]]; then
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cat >"$udev_rule" <<'IOEOF'
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# NVMe: no scheduler (multi-queue hardware handles it)
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ACTION=="add|change", KERNEL=="nvme[0-9]*", ATTR{queue/scheduler}="none"
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# SATA SSD: mq-deadline (low latency)
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ACTION=="add|change", KERNEL=="sd[a-z]", ATTR{queue/rotational}=="0", ATTR{queue/scheduler}="mq-deadline"
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# HDD: BFQ (fair bandwidth allocation)
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ACTION=="add|change", KERNEL=="sd[a-z]", ATTR{queue/rotational}=="1", ATTR{queue/scheduler}="bfq"
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IOEOF
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fi
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if [[ $changed == "false" ]]; then
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log_ok "All I/O schedulers already optimal."
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fi
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return 0
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}
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# ===================================================================
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# 3. Memory & swap tuning via sysctl
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# ===================================================================
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tweak_vm_sysctl() {
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local dropin="/etc/sysctl.d/90-desktop-performance.conf"
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# Desktop workloads: low swappiness, aggressive VFS caching, tuned dirty ratios
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local -A params=(
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["vm.swappiness"]="10"
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["vm.vfs_cache_pressure"]="50"
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["vm.dirty_ratio"]="15"
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["vm.dirty_background_ratio"]="5"
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["vm.dirty_writeback_centisecs"]="1500"
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["vm.page-cluster"]="0"
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)
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local needs_update=false
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local key
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for key in "${!params[@]}"; do
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local current
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current=$(sysctl -n "$key" 2>/dev/null || true)
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if [[ $current != "${params[$key]}" ]]; then
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needs_update=true
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break
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fi
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done
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if [[ $needs_update == "false" && -f $dropin ]]; then
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log_ok "VM sysctl parameters already tuned — skipping."
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return 0
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fi
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cat >"$dropin" <<'VMEOF'
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# Desktop performance tuning — managed by optimize_arch_desktop.sh
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#
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# vm.swappiness=10 — prefer keeping data in RAM over swapping
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# vm.vfs_cache_pressure=50 — favor keeping inode/dentry caches (speeds up file operations)
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# vm.dirty_ratio=15 — allow up to 15% RAM dirty before synchronous writeback
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# vm.dirty_background_ratio=5 — start async writeback at 5% dirty
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# vm.dirty_writeback_centisecs=1500 — flush dirty pages every 15s (less I/O churn)
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# vm.page-cluster=0 — read one page at a time from swap (reduces latency on SSD)
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vm.swappiness = 10
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vm.vfs_cache_pressure = 50
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vm.dirty_ratio = 15
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vm.dirty_background_ratio = 5
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vm.dirty_writeback_centisecs = 1500
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vm.page-cluster = 0
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VMEOF
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sysctl --system >/dev/null 2>&1
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return 0
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}
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# ===================================================================
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# 4. Network: TCP BBR + fastopen + buffer tuning
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# ===================================================================
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tweak_network_sysctl() {
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local dropin="/etc/sysctl.d/91-desktop-network.conf"
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# Check if BBR module is available
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if ! modprobe tcp_bbr 2>/dev/null; then
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log_warn "tcp_bbr kernel module unavailable — skipping network tuning."
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return 0
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fi
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local -A params=(
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["net.core.default_qdisc"]="fq"
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["net.ipv4.tcp_congestion_control"]="bbr"
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["net.ipv4.tcp_fastopen"]="3"
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["net.core.rmem_max"]="16777216"
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["net.core.wmem_max"]="16777216"
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["net.ipv4.tcp_rmem"]="4096 1048576 16777216"
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["net.ipv4.tcp_wmem"]="4096 1048576 16777216"
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["net.ipv4.tcp_mtu_probing"]="1"
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)
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local needs_update=false
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local key
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for key in "${!params[@]}"; do
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local current
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current=$(sysctl -n "$key" 2>/dev/null || true)
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# Normalize whitespace for comparison (kernel uses tabs)
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current=$(echo "$current" | xargs)
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local expected
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expected=$(echo "${params[$key]}" | xargs)
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if [[ $current != "$expected" ]]; then
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needs_update=true
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break
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fi
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done
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if [[ $needs_update == "false" && -f $dropin ]]; then
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log_ok "Network sysctl parameters already tuned — skipping."
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return 0
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fi
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cat >"$dropin" <<'NETEOF'
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# Network performance tuning — managed by optimize_arch_desktop.sh
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#
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# BBR congestion control — better throughput and lower latency than cubic
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# TCP fastopen — saves one RTT on repeated connections (both client and server)
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# Larger buffers — helps on high-bandwidth or high-latency links
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net.core.default_qdisc = fq
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net.ipv4.tcp_congestion_control = bbr
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net.ipv4.tcp_fastopen = 3
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net.core.rmem_max = 16777216
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net.core.wmem_max = 16777216
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net.ipv4.tcp_rmem = 4096 1048576 16777216
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net.ipv4.tcp_wmem = 4096 1048576 16777216
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net.ipv4.tcp_mtu_probing = 1
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NETEOF
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sysctl --system >/dev/null 2>&1
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return 0
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}
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# ===================================================================
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# 5. fstrim timer
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# ===================================================================
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tweak_fstrim() {
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if systemctl is-enabled fstrim.timer >/dev/null 2>&1; then
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log_ok "fstrim.timer already enabled — skipping."
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return 0
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fi
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systemctl enable --now fstrim.timer
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return 0
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}
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# ===================================================================
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# 6. NVIDIA GPU — max performance
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# ===================================================================
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tweak_nvidia_gpu() {
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if ! has_cmd nvidia-smi; then
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log_info "nvidia-smi not found — skipping GPU tuning."
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return 0
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fi
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# Enable persistence mode (keeps driver loaded, faster app launches)
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local persist_status
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persist_status=$(nvidia-smi --query-gpu=persistence_mode --format=csv,noheader 2>/dev/null | head -n 1 | xargs || true)
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if [[ $persist_status != "Enabled" ]]; then
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nvidia-smi -pm 1 >/dev/null 2>&1 || true
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log_info "NVIDIA persistence mode enabled."
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else
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log_ok "NVIDIA persistence mode already enabled."
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fi
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# Set power management to prefer maximum performance
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# PowerMizerMode: 1 = prefer max perf
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nvidia-smi -gps 0 >/dev/null 2>&1 || true
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# Persist via systemd service
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local service_file="/etc/systemd/system/nvidia-performance.service"
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if [[ ! -f $service_file ]]; then
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cat >"$service_file" <<'NVSVC'
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[Unit]
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Description=Set NVIDIA GPU to max performance mode
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After=nvidia-persistenced.service
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[Service]
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Type=oneshot
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ExecStart=/usr/bin/nvidia-smi -pm 1
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RemainAfterExit=yes
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[Install]
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WantedBy=multi-user.target
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NVSVC
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systemctl daemon-reload
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systemctl enable nvidia-performance.service 2>/dev/null || true
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fi
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# Ensure nvidia-persistenced is enabled
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if has_cmd nvidia-persistenced; then
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systemctl enable nvidia-persistenced.service 2>/dev/null || true
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if ! systemctl is-active nvidia-persistenced.service >/dev/null 2>&1; then
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systemctl start nvidia-persistenced.service 2>/dev/null || true
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fi
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fi
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return 0
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}
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# ===================================================================
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# 7. [AGGRESSIVE] Disable CPU vulnerability mitigations
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# ===================================================================
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tweak_mitigations() {
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if [[ $AGGRESSIVE != "true" ]]; then
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log_info "Skipping CPU mitigation disable (use --aggressive to enable)."
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return 0
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fi
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# Detect boot loader
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local boot_method=""
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if [[ -d /boot/loader/entries ]]; then
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boot_method="systemd-boot"
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elif [[ -f /etc/default/grub ]]; then
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boot_method="grub"
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else
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log_warn "Could not detect boot loader — skipping mitigation tweak."
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log_info "Manually add 'mitigations=off' to your kernel command line for extra speed."
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return 0
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fi
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if [[ $boot_method == "systemd-boot" ]]; then
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local entry
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entry=$(find /boot/loader/entries -name '*.conf' -print -quit 2>/dev/null || true)
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if [[ -n $entry ]]; then
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if grep -q 'mitigations=off' "$entry" 2>/dev/null; then
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log_ok "mitigations=off already set in systemd-boot — skipping."
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return 0
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fi
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# Append to the options line
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sed -i '/^options / s/$/ mitigations=off/' "$entry"
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log_warn "Added mitigations=off to $entry. REBOOT REQUIRED."
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log_warn "This trades security for ~5-15% performance. Only for isolated desktops."
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fi
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elif [[ $boot_method == "grub" ]]; then
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if grep -q 'mitigations=off' /etc/default/grub 2>/dev/null; then
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log_ok "mitigations=off already set in GRUB — skipping."
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return 0
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fi
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sed -i 's/^GRUB_CMDLINE_LINUX_DEFAULT="\(.*\)"/GRUB_CMDLINE_LINUX_DEFAULT="\1 mitigations=off"/' /etc/default/grub
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grub-mkconfig -o /boot/grub/grub.cfg
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log_warn "Added mitigations=off to GRUB config. REBOOT REQUIRED."
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fi
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return 0
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}
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# ===================================================================
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# 8. Disable NetworkManager-wait-online
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# ===================================================================
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tweak_nm_wait_online() {
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if ! systemctl is-enabled NetworkManager-wait-online.service >/dev/null 2>&1; then
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log_ok "NetworkManager-wait-online already disabled — skipping."
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return 0
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fi
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systemctl disable NetworkManager-wait-online.service
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return 0
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}
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# ===================================================================
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# 9. Journal vacuum + permanent cap
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# ===================================================================
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tweak_journal() {
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local usage_line
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usage_line=$(journalctl --disk-usage 2>/dev/null || true)
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local needs_vacuum=false
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if [[ $usage_line =~ ([0-9]+\.?[0-9]*)\ G ]]; then
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needs_vacuum=true
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fi
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if [[ $needs_vacuum == "true" ]]; then
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journalctl --vacuum-size=300M
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else
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log_ok "Journal already under 1GiB."
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fi
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|
|
local dropin_dir="/etc/systemd/journald.conf.d"
|
|
local dropin_file="$dropin_dir/size-limit.conf"
|
|
|
|
if [[ -f $dropin_file ]] && grep -q 'SystemMaxUse=300M' "$dropin_file"; then
|
|
log_ok "Journal size cap already configured."
|
|
else
|
|
mkdir -p "$dropin_dir"
|
|
cat >"$dropin_file" <<'JOURNALEOF'
|
|
[Journal]
|
|
SystemMaxUse=300M
|
|
JOURNALEOF
|
|
systemctl restart systemd-journald
|
|
fi
|
|
|
|
return 0
|
|
}
|
|
|
|
# ===================================================================
|
|
# 10. ananicy-cpp — automatic process nice/ionice/scheduler tuning
|
|
# ===================================================================
|
|
tweak_ananicy() {
|
|
# ananicy-cpp is the C++ rewrite, available in the AUR via ananicy-cpp
|
|
if systemctl is-enabled ananicy-cpp.service >/dev/null 2>&1; then
|
|
log_ok "ananicy-cpp is already enabled — skipping."
|
|
return 0
|
|
fi
|
|
|
|
if pacman -Qi ananicy-cpp >/dev/null 2>&1; then
|
|
systemctl enable --now ananicy-cpp.service
|
|
log_info "Enabled ananicy-cpp.service."
|
|
return 0
|
|
fi
|
|
|
|
# Check for the original ananicy
|
|
if pacman -Qi ananicy >/dev/null 2>&1; then
|
|
if ! systemctl is-enabled ananicy.service >/dev/null 2>&1; then
|
|
systemctl enable --now ananicy.service
|
|
log_info "Enabled ananicy.service."
|
|
else
|
|
log_ok "ananicy is already enabled."
|
|
fi
|
|
return 0
|
|
fi
|
|
|
|
log_info "ananicy-cpp is not installed."
|
|
log_info "Install from AUR for automatic per-process priority tuning:"
|
|
log_info " yay -S ananicy-cpp cachyos-ananicy-rules-git"
|
|
|
|
return 0
|
|
}
|
|
|
|
# ===================================================================
|
|
# Apply all tweaks
|
|
# ===================================================================
|
|
main() {
|
|
apply_tweak \
|
|
"Tweak 1/10: Set CPU governor to performance on all cores" \
|
|
tweak_cpu_governor
|
|
|
|
apply_tweak \
|
|
"Tweak 2/10: Optimize I/O scheduler per drive type" \
|
|
tweak_io_scheduler
|
|
|
|
apply_tweak \
|
|
"Tweak 3/10: Tune VM/memory sysctl for desktop responsiveness" \
|
|
tweak_vm_sysctl
|
|
|
|
apply_tweak \
|
|
"Tweak 4/10: Enable TCP BBR + fastopen + larger buffers" \
|
|
tweak_network_sysctl
|
|
|
|
apply_tweak \
|
|
"Tweak 5/10: Enable fstrim.timer for SSD TRIM maintenance" \
|
|
tweak_fstrim
|
|
|
|
apply_tweak \
|
|
"Tweak 6/10: NVIDIA GPU persistence mode + max performance" \
|
|
tweak_nvidia_gpu
|
|
|
|
apply_tweak \
|
|
"Tweak 7/10: CPU vulnerability mitigations (--aggressive only)" \
|
|
tweak_mitigations
|
|
|
|
apply_tweak \
|
|
"Tweak 8/10: Disable NetworkManager-wait-online (faster boot)" \
|
|
tweak_nm_wait_online
|
|
|
|
apply_tweak \
|
|
"Tweak 9/10: Vacuum & cap systemd journal at 300M" \
|
|
tweak_journal
|
|
|
|
apply_tweak \
|
|
"Tweak 10/10: Enable ananicy-cpp process prioritization" \
|
|
tweak_ananicy
|
|
|
|
# ---------------------------------------------------------------
|
|
# Summary
|
|
# ---------------------------------------------------------------
|
|
echo ""
|
|
echo "=============================="
|
|
echo " Desktop Optimization Summary"
|
|
echo "=============================="
|
|
|
|
if [[ $DRY_RUN == "true" ]]; then
|
|
log_info "Dry-run mode — no changes were made."
|
|
else
|
|
log_ok "Optimizations applied: $TWEAKS_APPLIED"
|
|
if [[ $TWEAKS_SKIPPED -gt 0 ]]; then
|
|
log_warn "Optimizations skipped: $TWEAKS_SKIPPED"
|
|
fi
|
|
fi
|
|
|
|
echo ""
|
|
|
|
# Advisory: check for noatime
|
|
local root_mount_opts
|
|
root_mount_opts=$(findmnt -n -o OPTIONS / 2>/dev/null || true)
|
|
if [[ -n $root_mount_opts ]] && ! echo "$root_mount_opts" | grep -q 'noatime'; then
|
|
log_info "Tip: Your root filesystem does not use 'noatime'."
|
|
log_info " Adding 'noatime' to /etc/fstab can reduce unnecessary disk writes."
|
|
log_info " (Change 'relatime' or 'atime' to 'noatime' in /etc/fstab, then reboot)"
|
|
fi
|
|
|
|
if [[ $AGGRESSIVE == "true" ]]; then
|
|
log_warn "Aggressive mode was used — mitigations=off trades security for speed."
|
|
fi
|
|
|
|
echo ""
|
|
log_info "Reboot recommended for kernel parameter and boot loader changes to take effect."
|
|
log_info "Verify after reboot with: diagnose_arch_performance.sh"
|
|
}
|
|
|
|
main
|