diff options
| author | Mateusz Guzik <mjg@FreeBSD.org> | 2025-09-30 14:06:48 +0000 |
|---|---|---|
| committer | Mateusz Guzik <mjg@FreeBSD.org> | 2025-09-30 16:14:55 +0000 |
| commit | 2bdc89535a8837347bb3b523715bba021dea4418 (patch) | |
| tree | 437f667af9d58d3a0aa23ff6c21710d8f6c18c95 | |
| parent | aa1afb69dcedfc68859815987c46997500f834c3 (diff) | |
amd64: bump sleepq hash size to 2048
This is the most contended lock type during the first hour of -j 104 poudriere.
Drops significantly with the change.
Note there are suspicous acquires which most likely don't need to
happen, artificially exacerbating tehe problem..
| -rw-r--r-- | sys/amd64/include/param.h | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/sys/amd64/include/param.h b/sys/amd64/include/param.h index 5a9c3162e14c..0654bb9de790 100644 --- a/sys/amd64/include/param.h +++ b/sys/amd64/include/param.h @@ -150,6 +150,15 @@ (((va) >= kva_layout.dmap_low && (va) < kva_layout.dmap_high) || \ ((va) >= kva_layout.km_low && (va) < kva_layout.km_high)) -#define SC_TABLESIZE 1024 /* Must be power of 2. */ +/* + * Must be power of 2. + * + * Perhaps should be autosized on boot based on found ncpus. + */ +#if MAXCPU > 256 +#define SC_TABLESIZE 2048 +#else +#define SC_TABLESIZE 1024 +#endif #endif /* !_AMD64_INCLUDE_PARAM_H_ */ |