Messages in this thread | | | Date | Tue, 30 Oct 2007 08:26:58 +0100 | From | Ingo Molnar <> | Subject | Re: aim7 -30% regression in 2.6.24-rc1 |
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* Zhang, Yanmin <yanmin_zhang@linux.intel.com> wrote:
> sub-bisecting captured patch > 38ad464d410dadceda1563f36bdb0be7fe4c8938(sched: uniform tunings) > caused 20% regression of aim7. > > The last 10% should be also related to sched parameters, such like > sysctl_sched_min_granularity.
ah, interesting. Since you have CONFIG_SCHED_DEBUG enabled, could you please try to figure out what the best value for /proc/sys/kernel_sched_latency, /proc/sys/kernel_sched_nr_latency and /proc/sys/kernel_sched_min_granularity is?
there's a tuning constraint for kernel_sched_nr_latency:
- kernel_sched_nr_latency should always be set to kernel_sched_latency/kernel_sched_min_granularity. (it's not a free tunable)
i suspect a good approach would be to double the value of kernel_sched_latency and kernel_sched_nr_latency in each tuning iteration, while keeping kernel_sched_min_granularity unchanged. That will excercise the tuning values of the 2.6.23 kernel as well.
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