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| author | Alexander Motin <mav@FreeBSD.org> | 2012-03-09 19:09:08 +0000 |
|---|---|---|
| committer | Alexander Motin <mav@FreeBSD.org> | 2012-03-09 19:09:08 +0000 |
| commit | b3f40a410789bab4958e57f096e45fff1ecdd05d (patch) | |
| tree | 86aa0572932a274b043b644e365e98b76d2b7747 /sys/kern/sched_ule.c | |
| parent | 6b381ff3321824b789d5be23b1d9ba6cfc43f272 (diff) | |
| download | src-b3f40a410789bab4958e57f096e45fff1ecdd05d.tar.gz src-b3f40a410789bab4958e57f096e45fff1ecdd05d.zip | |
Make kern.sched.idlespinthresh default value adaptive depending of HZ.
Otherwise with HZ above 8000 CPU may never skip timer ticks on idle.
Notes
Notes:
svn path=/head/; revision=232740
Diffstat (limited to 'sys/kern/sched_ule.c')
| -rw-r--r-- | sys/kern/sched_ule.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/sys/kern/sched_ule.c b/sys/kern/sched_ule.c index 8bd2f9678260..5fb15e355dc8 100644 --- a/sys/kern/sched_ule.c +++ b/sys/kern/sched_ule.c @@ -212,7 +212,7 @@ static int preempt_thresh = 0; #endif static int static_boost = PRI_MIN_BATCH; static int sched_idlespins = 10000; -static int sched_idlespinthresh = 16; +static int sched_idlespinthresh = -1; /* * tdq - per processor runqs and statistics. All fields are protected by the @@ -1390,6 +1390,8 @@ sched_initticks(void *dummy) steal_thresh = min(fls(mp_ncpus) - 1, 3); affinity = SCHED_AFFINITY_DEFAULT; #endif + if (sched_idlespinthresh < 0) + sched_idlespinthresh = max(16, 2 * hz / realstathz); } |