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