Author: mav
Date: Mon Jun 4 07:12:36 2012
New Revision: 236546
URL: http://svn.freebsd.org/changeset/base/236546
Log:
MFC r232740:
Make kern.sched.idlespinthresh default value adaptive depending of HZ.
Otherwise with HZ above 8000 CPU may never skip timer ticks on idle.
Modified:
stable/9/sys/kern/sched_ule.c
Directory Properties:
stable/9/sys/ (props changed)
Modified: stable/9/sys/kern/sched_ule.c
==============================================================================
--- stable/9/sys/kern/sched_ule.c Mon Jun 4 07:12:11 2012
(r236545)
+++ stable/9/sys/kern/sched_ule.c Mon Jun 4 07:12:36 2012
(r236546)
@@ -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
@@ -1410,6 +1410,8 @@ 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);
}
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