Author: mav
Date: Mon Mar 11 12:02:03 2013
New Revision: 248154
URL: http://svnweb.freebsd.org/changeset/base/248154
Log:
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).
Modified:
head/sys/dev/acpica/acpi_hpet.c
Modified: head/sys/dev/acpica/acpi_hpet.c
==============================================================================
--- head/sys/dev/acpica/acpi_hpet.c Mon Mar 11 10:56:46 2013
(r248153)
+++ head/sys/dev/acpica/acpi_hpet.c Mon Mar 11 12:02:03 2013
(r248154)
@@ -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;
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