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| author | jhb <jhb@FreeBSD.org> | 2006-03-09 16:38:52 +0000 |
|---|---|---|
| committer | jhb <jhb@FreeBSD.org> | 2006-03-09 16:38:52 +0000 |
| commit | 329536bd480f675cd0825c0112204e0ddff2f329 (patch) | |
| tree | 20dfae939c3921a2db40d4bd35f24ac1c4b0e687 /sys/i386 | |
| parent | 4e16f8107611368c9701ed13c6f6623a863d5429 (diff) | |
| download | FreeBSD-src-329536bd480f675cd0825c0112204e0ddff2f329.zip FreeBSD-src-329536bd480f675cd0825c0112204e0ddff2f329.tar.gz | |
Flip the switch and don't route interrupts to hyperthreads in a HT system.
In at least one benchmark this showed around a 20% performance increase.
If other workloads do benefit from having hyperthreads service interrupts,
we can always make this a loader tunable.
MFC after: 3 days
Tested by: ps
Diffstat (limited to 'sys/i386')
| -rw-r--r-- | sys/i386/i386/mp_machdep.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/sys/i386/i386/mp_machdep.c b/sys/i386/i386/mp_machdep.c index 4b960b7..1b36f1c 100644 --- a/sys/i386/i386/mp_machdep.c +++ b/sys/i386/i386/mp_machdep.c @@ -661,12 +661,12 @@ set_interrupt_apic_ids(void) continue; if (cpu_info[apic_id].cpu_bsp) continue; -#if 0 + /* Don't let hyperthreads service interrupts. */ if (hyperthreading_cpus > 1 && apic_id % hyperthreading_cpus != 0) continue; -#endif + intr_add_cpu(apic_id); } } |
