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| author | mav <mav@FreeBSD.org> | 2013-03-11 12:02:03 +0000 |
|---|---|---|
| committer | mav <mav@FreeBSD.org> | 2013-03-11 12:02:03 +0000 |
| commit | 9f5713a48c32281e2c79d0fec47f87e2be0beb19 (patch) | |
| tree | 535bb5d37f3e29642a0241103d4e01697127d5f6 | |
| parent | bc04f839beee8a050a7425354a4dd381b9a7ca25 (diff) | |
| download | FreeBSD-src-9f5713a48c32281e2c79d0fec47f87e2be0beb19.zip FreeBSD-src-9f5713a48c32281e2c79d0fec47f87e2be0beb19.tar.gz | |
Reduce HPET eventtimer priority on systems with 8 or more cores. Price of
the lock congestion may be too high there (2.5% on 4x4 core AMD Opteron).
| -rw-r--r-- | sys/dev/acpica/acpi_hpet.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/sys/dev/acpica/acpi_hpet.c b/sys/dev/acpica/acpi_hpet.c index 9b9c966..b0cd3d8 100644 --- a/sys/dev/acpica/acpi_hpet.c +++ b/sys/dev/acpica/acpi_hpet.c @@ -675,7 +675,8 @@ hpet_attach(device_t dev) if (t->pcpu_master >= 0) { t->et.et_flags |= ET_FLAGS_PERCPU; t->et.et_quality += 100; - } + } if (mp_ncpus >= 8) + t->et.et_quality -= 100; if ((t->caps & HPET_TCAP_PER_INT) == 0) t->et.et_quality -= 10; t->et.et_frequency = sc->freq; |
