Re: aim7 -30% regression in 2.6.24-rc1

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To: Zhang, Yanmin <yanmin_zhang@...>
Cc: LKML <linux-kernel@...>, Peter Zijlstra <a.p.zijlstra@...>
Date: Tuesday, October 30, 2007 - 3:26 am

* Zhang, Yanmin <yanmin_zhang@linux.intel.com> wrote:


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.

	Ingo
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Messages in current thread:
aim7 -30% regression in 2.6.24-rc1, Zhang, Yanmin, (Fri Oct 26, 5:43 am)
Re: aim7 -30% regression in 2.6.24-rc1, Ingo Molnar, (Fri Oct 26, 7:23 am)
Re: aim7 -30% regression in 2.6.24-rc1, Zhang, Yanmin, (Sun Oct 28, 10:22 pm)
Re: aim7 -30% regression in 2.6.24-rc1, Zhang, Yanmin, (Mon Oct 29, 5:37 am)
Re: aim7 -30% regression in 2.6.24-rc1, Zhang, Yanmin, (Mon Oct 29, 10:12 pm)
Re: aim7 -30% regression in 2.6.24-rc1, Ingo Molnar, (Tue Oct 30, 3:26 am)
Re: aim7 -30% regression in 2.6.24-rc1, Zhang, Yanmin, (Tue Oct 30, 4:36 am)
Re: aim7 -30% regression in 2.6.24-rc1, Zhang, Yanmin, (Wed Oct 31, 5:57 am)
Re: aim7 -30% regression in 2.6.24-rc1, Zhang, Yanmin, (Thu Nov 1, 5:34 am)
Re: aim7 -30% regression in 2.6.24-rc1, Cyrus Massoumi, (Thu Nov 1, 6:02 am)
Re: aim7 -30% regression in 2.6.24-rc1, Zhang, Yanmin, (Sun Nov 4, 9:24 pm)
Re: aim7 -30% regression in 2.6.24-rc1, Cyrus Massoumi, (Mon Nov 5, 5:37 am)
Re: aim7 -30% regression in 2.6.24-rc1, Zhang, Yanmin, (Wed Nov 7, 1:30 am)
Re: aim7 -30% regression in 2.6.24-rc1, Peter Zijlstra, (Wed Oct 31, 6:30 am)
Re: aim7 -30% regression in 2.6.24-rc1, Ingo Molnar, (Thu Nov 1, 4:58 am)
Re: aim7 -30% regression in 2.6.24-rc1, Peter Zijlstra, (Fri Oct 26, 5:53 am)
Re: aim7 -30% regression in 2.6.24-rc1, Zhang, Yanmin, (Sun Oct 28, 8:15 pm)