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sched: fix minimum granularity tunings

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increase the default minimum granularity some more - this gives us
more performance in aim7 benchmarks.

also correct some comments: we scale with ilog(ncpus) + 1.

Signed-off-by: Zou Nan hai <nanhai.zou@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Zou Nan hai 2007-11-26 21:21:49 +01:00 committed by Ingo Molnar
parent 58e1010da3
commit 722aab0c3b
1 changed files with 6 additions and 6 deletions
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12
kernel/sched_fair.c
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@ -22,7 +22,7 @@
/*
* Targeted preemption latency for CPU-bound tasks:
* (default: 20ms * ilog(ncpus), units: nanoseconds)
* (default: 20ms * (1 + ilog(ncpus)), units: nanoseconds)
*
* NOTE: this latency value is not the same as the concept of
* 'timeslice length' - timeslices in CFS are of variable length
@ -36,14 +36,14 @@ unsigned int sysctl_sched_latency = 20000000ULL;
/*
* Minimal preemption granularity for CPU-bound tasks:
* (default: 1 msec * ilog(ncpus), units: nanoseconds)
* (default: 4 msec * (1 + ilog(ncpus)), units: nanoseconds)
*/
unsigned int sysctl_sched_min_granularity = 1000000ULL;
unsigned int sysctl_sched_min_granularity = 4000000ULL;
/*
* is kept at sysctl_sched_latency / sysctl_sched_min_granularity
*/
static unsigned int sched_nr_latency = 20;
static unsigned int sched_nr_latency = 5;
/*
* After fork, child runs first. (default) If set to 0 then
@ -61,7 +61,7 @@ unsigned int __read_mostly sysctl_sched_compat_yield;
/*
* SCHED_BATCH wake-up granularity.
* (default: 10 msec * ilog(ncpus), units: nanoseconds)
* (default: 10 msec * (1 + ilog(ncpus)), units: nanoseconds)
*
* This option delays the preemption effects of decoupled workloads
* and reduces their over-scheduling. Synchronous workloads will still
@ -71,7 +71,7 @@ unsigned int sysctl_sched_batch_wakeup_granularity = 10000000UL;
/*
* SCHED_OTHER wake-up granularity.
* (default: 10 msec * ilog(ncpus), units: nanoseconds)
* (default: 10 msec * (1 + ilog(ncpus)), units: nanoseconds)
*
* This option delays the preemption effects of decoupled workloads
* and reduces their over-scheduling. Synchronous workloads will still