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Make kern.sched.idlespinthresh default value adaptive depending of HZ.

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Otherwise with HZ above 8000 CPU may never skip timer ticks on idle.
This commit is contained in:
Alexander Motin 2012-03-09 19:09:08 +00:00
parent 6b381ff332
commit b3f40a4107
1 changed files with 3 additions and 1 deletions
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4
sys/kern/sched_ule.c
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@ -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);
}