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Commit 722aab0c authored by Zou Nan hai's avatar Zou Nan hai Committed by Ingo Molnar
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sched: fix minimum granularity tunings 



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: default avatarZou Nan hai <nanhai.zou@intel.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 58e1010d

kernel/sched_fair.c

+6 −6
Original line number Diff line number Diff line
@@ -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