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Krzysztof kuhy Rudnicki
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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
13 lines
790 B
Plaintext
13 lines
790 B
Plaintext
# AMD X3D (dual-CCD V-cache) CPU: prefer the V-cache CCD for games.
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# amd_x3d_mode=cache makes the scheduler rank the V-cache CCD (CPUs 0-5,12-17)
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# above the frequency CCD; the firmware default is "frequency". Background jobs
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# are already pinned to the other CCD (6-11,18-23).
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#
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# Why udev and not tmpfiles.d: a tmpfiles `w` line needs the exact device path
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# (a firmware-assigned ACPI name) and runs once at boot, so it
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# misses a driver rebind or module reload. This rule matches the DRIVER, hard-
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# codes no device name, and fires on "add" (boot coldplug, driver already
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# bound) and on "bind" (every later driver (re)bind, e.g. modprobe -r/+).
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# Installed by fixes/fix_amd_x3d_vcache.sh.
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ACTION=="add|bind", SUBSYSTEM=="platform", DRIVER=="amd_x3d_vcache", ATTR{amd_x3d_mode}="cache"
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