From d274a4cee190c880ec25b60501efe50c4435b3d7 Mon Sep 17 00:00:00 2001 From: Ingo Molnar Date: Mon, 15 Oct 2007 17:00:14 +0200 Subject: sched: update comment update comment: clarify time-slices and remove obsolete tuning detail. Signed-off-by: Ingo Molnar --- kernel/sched_fair.c | 12 +++++------- 1 file changed, 5 insertions(+), 7 deletions(-) (limited to 'kernel') diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c index f819f943fb8..ec1592eb8d0 100644 --- a/kernel/sched_fair.c +++ b/kernel/sched_fair.c @@ -25,14 +25,12 @@ * (default: 20ms, units: nanoseconds) * * NOTE: this latency value is not the same as the concept of - * 'timeslice length' - timeslices in CFS are of variable length. - * (to see the precise effective timeslice length of your workload, - * run vmstat and monitor the context-switches field) + * 'timeslice length' - timeslices in CFS are of variable length + * and have no persistent notion like in traditional, time-slice + * based scheduling concepts. * - * On SMP systems the value of this is multiplied by the log2 of the - * number of CPUs. (i.e. factor 2x on 2-way systems, 3x on 4-way - * systems, 4x on 8-way systems, 5x on 16-way systems, etc.) - * Targeted preemption latency for CPU-bound tasks: + * (to see the precise effective timeslice length of your workload, + * run vmstat and monitor the context-switches (cs) field) */ const_debug unsigned int sysctl_sched_latency = 20000000ULL; -- cgit v1.2.3