mirror of
https://github.com/kuhyx/testsAndMisc.git
synced 2026-11-11 22:34:02 +01:00
Krzysztof kuhy Rudnicki
63650fbc45
setup_offline_docs.sh 713 -> 121 across six libs, carved one language at a time since the first cut left offline_cpp at 545. optimize_arch_ desktop.sh 623 -> 118. Two recurring traps again: a script with no SCRIPT_DIR at all, and libs that chained rather than being sourced from the entry. Both now checked for routinely. libre_translate.sh is reverted and stays at 488. Exporting GENERATED to fix one SC2034 revealed eighteen more - when a fix uncovers more of the same, the seam is imaginary, not the fix wrong. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_011w2Pj4Ek3ZNMQVYcFHgXDY
123 lines
3.8 KiB
Bash
Executable File
123 lines
3.8 KiB
Bash
Executable File
#!/bin/bash
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# VM and network sysctl tuning.
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#
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# Sourced by optimize_arch_desktop.sh; split out to keep it under the 250-line
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# cap. Sourced rather than run, so it inherits the caller's strict mode
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# and the variables defined above the source line.
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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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