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Seg/gaming performance - #9
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SegMind25 merged 12 commits intoOct 20, 2026
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Two conflicts with what SegLinux Setup already writes for zram, found while reading the code again: - Setup writes /etc/sysctl.d/90-seglinux-zram.conf with vm.swappiness = 180. seg tune raised swappiness to only 100 with zram on and its 99-seg.conf sorts after Setup's file, so installed systems would have ended up at 100. zram swap now means at least 180 in every profile. - Setup also writes /etc/udev/rules.d/99-seglinux-zram.rules, which sizes and formats zram0 (fstab switches it on). seg zram on reset a sized device, which could run under that rule's mkswap. A sized device is now kept as it is, and the package's udev rule calls seg zram on --if-unconfigured, which leaves it alone entirely, as the old script did. An explicit --size still resizes. Also puts back the comment in disk.rs that named Setup's udev rule: it was right, and the earlier "fix" of it was wrong. Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_0119819Vrp5vJojQCT1CjWog
Found by booting the Lite image in QEMU: killprocs, mount-ro and savecache are enabled in OpenRC's `shutdown` runlevel and are, by design, not running while the system is up, yet seg doctor called them "enabled but stopped". Service gets runs_at_boot (enabled in sysinit, boot or default on OpenRC; the same as enabled on the other inits) and doctor looks at that. Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_0119819Vrp5vJojQCT1CjWog
…mits The ISO check built both editions on this branch and booted Lite in QEMU (run 39488187492); its results are in docs/lean-audit.md: the full ISO is 4.7 % smaller and 475 MiB less is installed, Lite is unchanged. The audit claimed the kernel headers were on both editions; Lite never had them, so the table says full only. Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_0119819Vrp5vJojQCT1CjWog
…g tune gaming A lightweight GameMode inside the existing seg tool (libc is the only new dependency; every unsafe block is in game/proc.rs). - seg game run -- CMD (Steam: `seg game run -- %command%`): CPU governor and energy preference to performance and an AMD GPU to its high power level for the length of the game, through a root helper that several games share (state in /run/seg, dead games noticed by pid and start time); nice -4 and best I/O priority for the game; the screen saver held off over a hand-written D-Bus call (org.freedesktop.ScreenSaver.Inhibit); optional pinning to the V-Cache complex of an X3D CPU (found from the L3 cache sizes in /sys); MangoHud and gamescope wrapping; shader cache sizes set. Everything is put back when the game ends, on SIGINT/SIGTERM/SIGHUP (INT is not forwarded: the terminal already did) and when seg itself panics (a hook, since panic=abort skips destructors). - Per-game profiles in ~/.config/seg/games.toml, matched by the names in the command (a Proton command line matches its .exe); a small TOML subset parser that names the line of a mistake. - seg game check: 15 PASS/WARN/FAIL checks (Vulkan, lib32 drivers, GPU driver, ntsync, max_map_count, open files, kernel and a fallback kernel, amd-pstate, governor, may boost, hugepages, split lock, compaction, mitigations), each failure with its exact fix. - seg game setup: the driver packages for the GPUs found (sysfs + lspci); --yes installs them. Only for hardware that is there. - seg game apply (for the seg-game service), audio on|off (low-latency PipeWire, per user), unsafe-boost on|off (mitigations=off, behind a warning and --i-understand, never done by anything else). - seg tune gaming: low swappiness without zram (180 with it), warm caches, short writeback; the governor stays dynamic. - Presets (all off until asked): MangoHud, low-latency PipeWire, the sudoers rule for the gamemode group, seg-game services for OpenRC, runit, dinit and s6. 183 unit tests use fake /sys and /proc trees in tests/fixtures (7950X3D, second-CCD V-Cache, 7800X3D, ordinary CPUs, a VM; AMD, NVIDIA Ada and Pascal, Intel Arc, a hybrid laptop). Release binary 566,576 -> 722,808 bytes. Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_0119819Vrp5vJojQCT1CjWog
segctl 0.1.0-2 installs the seg-game service for OpenRC, runit, dinit and s6, /etc/sudoers.d/seg-game (the one root helper seg game run calls, for the gamemode group only) and the MangoHud and low-latency PipeWire presets under /usr/share/seg, all off until asked. The install script creates the group (a chroot-safe getent/groupadd) and enables seg-game on the init that is installed; an upgrade from 0.1.0-1 gets the new service, nothing else is re-enabled. Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_0119819Vrp5vJojQCT1CjWog
…odeset - vm.compaction_proactiveness = 0: no background memory defragmentation while a game allocates (what SteamOS sets); on-demand compaction stays. - nofile hard limit 524288 -> 1048576 (the kernel's fs.nr_open maximum) for Wine's esync/fsync; members of gamemode may use nice -10 for seg game run. - MESA_SHADER_CACHE_MAX_SIZE 4G -> 10G and the NVIDIA cache set to 10 GiB without the cleanup that deletes it when full (profile.d, so every init; a value set by the user wins). - nvidia_drm modeset=1 fbdev=1 (needed by Wayland compositors); does nothing unless the driver is installed. - vm.swappiness is deliberately not in this file: 180 with zram is Setup's, 10 without it is seg tune gaming's. Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_0119819Vrp5vJojQCT1CjWog
wine-staging provides wine and adds the Staging patches (esync/fsync and NTSYNC support, game fixes); lib32-mangohud covers 32-bit games. Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_0119819Vrp5vJojQCT1CjWog
…g-game - Install the other kernel (linux beside linux-zen and the reverse) as a boot menu entry to fall back on, when online; the kernel that runs is never removed. performance.fallback_kernel = false skips it. - Kernel command line: transparent_hugepage=madvise on every kernel and amd_pstate=active on AuthenticAMD; a parameter of the same name in the answer file replaces the default. - seg-game joins the default services, so the gaming sysctls and /dev/ntsync permissions apply on whichever init the install uses. Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_0119819Vrp5vJojQCT1CjWog
…iles - The dependency guard allows seg, lexopt and libc (3 lines of cargo tree). - unsafe may only appear in src/game/proc.rs. - visudo -cf checks the sudoers rule seg game run depends on. - shellcheck covers the seg-game OpenRC script (the runit one is already matched by the glob). Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_0119819Vrp5vJojQCT1CjWog
…od, changelog - docs/gaming.md (the existing page; a second docs/GAMING.md would collide with it on case-insensitive checkouts): the seg game walkthrough, Steam and Lutris launch options, what the boost changes and how it is undone, a table of every seg game check line, safety notes, the updated tuning table and a stock-versus-seg-game benchmark method with MangoHud logs and a summary script (tested against an independent calculation on synthetic frame times; no benchmark numbers are given). - tools/seg/README.md and docs/seg.md: the game commands, the gaming tune profile, the second dependency, the code layout and the privilege model. - README.md and a new CHANGELOG.md. Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_0119819Vrp5vJojQCT1CjWog
CI's pacman -Sp on a real Artix container reported it as the only missing package of the full edition (wine-staging resolves). Removed from the profile and from seg game setup --games, with a test so it is not added back unchecked, and documented: 32-bit games get no MangoHud overlay unless the user builds lib32-mangohud from the AUR, which the base does not use. Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_0119819Vrp5vJojQCT1CjWog
CI only checked the packages in the ISO profiles, so nvidia-open-dkms, nvidia-utils, lib32-nvidia-utils, nvidia-settings and vulkan-nouveau, which seg game setup (and Setup) install on demand, were never looked up in the repositories. A unit test now pins the union of everything seg game setup can choose (tests/setup-packages.txt; SEG_WRITE_FIXTURES=1 rewrites it) and check-packages.sh -x resolves that list on top of the image in every package job. Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_0119819Vrp5vJojQCT1CjWog
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