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Krzysztof kuhy Rudnicki
32b94bfbd2
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amd_x3d_mode defaulted to frequency, so the scheduler preferred the non-V-cache CCD. kuhy chose cache: games prefer CPUs 0-5,12-17; background jobs are already pinned to 6-11,18-23. A udev rule matches DRIVER amd_x3d_vcache on add (boot coldplug) and bind (any rebind), so it hard-codes no device name and survives a rebind, unlike a tmpfiles w line. fixes/fix_amd_x3d_vcache.sh installs it, fires a synthetic bind event and checks the mode ends on cache. Same layout as fix_webcam_c270.sh, with a bats test. Host: mode frequency -> cache, prefcore ranking now favours 0-5,12-17. vmbox has no X3D device: only the install step was proven there. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01WzxdWYWDKuhbBAoNETfoB9
86 lines
2.5 KiB
Bash
Executable File
86 lines
2.5 KiB
Bash
Executable File
#!/bin/bash
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# ============================================================================
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# AMD X3D: set the V-cache scheduling mode to "cache" (udev rule)
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#
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# The scheduler then prefers the V-cache CCD for games. The rule re-applies the
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# setting on every boot and driver rebind; rationale lives in
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# 60-amd-x3d-vcache-mode.rules.
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#
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# fix_amd_x3d_vcache.sh install the rule and apply it now
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# fix_amd_x3d_vcache.sh --remove remove the rule (firmware default returns on reboot)
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# fix_amd_x3d_vcache.sh --status show rule state and the live mode
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# ============================================================================
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set -euo pipefail
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SCRIPT_NAME="$(basename "$0")"
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SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
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readonly SCRIPT_NAME SCRIPT_DIR
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readonly RULE_NAME="60-amd-x3d-vcache-mode.rules"
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readonly RULE_SRC="$SCRIPT_DIR/$RULE_NAME"
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# Both overridable so the tests can point them at a scratch tree.
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readonly RULE_DST="${X3D_RULES_DIR:-/etc/udev/rules.d}/$RULE_NAME"
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readonly DRIVER_SYSFS="${X3D_DRIVER_SYSFS:-/sys/bus/platform/drivers/amd_x3d_vcache}"
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log() { echo "[$SCRIPT_NAME] $*"; }
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# Live mode of every bound X3D device, one "<device>=<mode>" per line.
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live_modes() {
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local f
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for f in "$DRIVER_SYSFS"/*/amd_x3d_mode; do
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[[ -e $f ]] || continue
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echo "$(basename "$(dirname "$f")")=$(cat "$f")"
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done
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}
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install_rule() {
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sudo install -m 644 "$RULE_SRC" "$RULE_DST"
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sudo udevadm control --reload
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log "installed $RULE_DST"
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# No driver, or a driver with no device (a VM): nothing to apply yet.
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if [[ -z "$(live_modes)" ]]; then
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log "no X3D device; rule applies when the driver binds"
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return
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fi
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# A synthetic bind event runs the rule against the live device by driver,
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# so no device name is needed here either.
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sudo udevadm trigger --action=bind --subsystem-match=platform \
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--property-match=DRIVER=amd_x3d_vcache
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sudo udevadm settle --timeout=10
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local modes
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modes="$(live_modes)"
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if [[ -n $modes ]] && ! grep -qv '=cache$' <<<"$modes"; then
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log "applied: $modes"
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else
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log "mode is not cache after trigger: ${modes:-no device}"
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exit 1
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fi
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}
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remove_rule() {
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sudo rm -f "$RULE_DST"
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sudo udevadm control --reload
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log "removed $RULE_DST"
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}
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show_status() {
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if [[ -f $RULE_DST ]]; then
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log "rule: installed"
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else
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log "rule: not installed"
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fi
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log "mode: $(live_modes | tr '\n' ' ')"
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}
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case "${1:-}" in
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"") install_rule ;;
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--remove) remove_rule ;;
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--status) show_status ;;
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-h | --help) sed -n '4,12p' "$0" | sed 's/^# \{0,3\}//' ;;
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*)
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log "unknown option: $1"
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exit 2
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;;
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esac
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