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sched: Tweak sched_latency and min_granularity 

Allow LAST_BUDDY to kick in sooner, improving cache utilization as soon as
a second buddy pair arrives on scene.  The cost is latency starting to climb
sooner, the tbenefit for tbench 8 on my Q6600 box is ~2%.  No detrimental
effects noted in normal idesktop usage.

Signed-off-by: Mike Galbraith <efault@gmx.de>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1268301285.6785.34.camel@marge.simson.net>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Mike Galbraith 2010-03-11 17:17:15 +01:00 committed by Ingo Molnar
parent a64692a3af
commit 21406928af
1 changed files with 6 additions and 6 deletions
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12
kernel/sched_fair.c
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@ -35,8 +35,8 @@
* (to see the precise effective timeslice length of your workload, * (to see the precise effective timeslice length of your workload,
* run vmstat and monitor the context-switches (cs) field) * run vmstat and monitor the context-switches (cs) field)
*/ */
unsigned int sysctl_sched_latency = 5000000ULL; unsigned int sysctl_sched_latency = 6000000ULL;
unsigned int normalized_sysctl_sched_latency = 5000000ULL; unsigned int normalized_sysctl_sched_latency = 6000000ULL;
/* /*
* The initial- and re-scaling of tunables is configurable * The initial- and re-scaling of tunables is configurable
@ -52,15 +52,15 @@ enum sched_tunable_scaling sysctl_sched_tunable_scaling
/* /*
* Minimal preemption granularity for CPU-bound tasks: * Minimal preemption granularity for CPU-bound tasks:
* (default: 1 msec * (1 + ilog(ncpus)), units: nanoseconds) * (default: 2 msec * (1 + ilog(ncpus)), units: nanoseconds)
*/ */
unsigned int sysctl_sched_min_granularity = 1000000ULL; unsigned int sysctl_sched_min_granularity = 2000000ULL;
unsigned int normalized_sysctl_sched_min_granularity = 1000000ULL; unsigned int normalized_sysctl_sched_min_granularity = 2000000ULL;
/* /*
* is kept at sysctl_sched_latency / sysctl_sched_min_granularity * is kept at sysctl_sched_latency / sysctl_sched_min_granularity
*/ */
static unsigned int sched_nr_latency = 5; static unsigned int sched_nr_latency = 3;
/* /*
* After fork, child runs first. If set to 0 (default) then * After fork, child runs first. If set to 0 (default) then