linux-kernel - Re: scale sysctl_sched_shares_ratelimit with nr

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Date:	Mon, 18 Aug 2008 09:01:47 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	"Zhang, Yanmin" <yanmin.zhang@...el.com>
Cc:	a.p.zijlstra@...llo.nl,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: scale sysctl_sched_shares_ratelimit with nr_cpus


* Zhang, Yanmin <yanmin.zhang@...el.com> wrote:

> >>cool. It's already upstream (post-rc3 commit):
> [YM] But comparing with 2.6.26, volanoMark result still has about 60%
> regression.

Does a scheduler trace show anything about why that drop happens? Do 
something like this to trace the scheduler:

assuming debugfs is mounted under /debug and CONFIG_SCHED_TRACER=y:

  echo 1 > /debug/tracing/tracing_cpumask
  echo sched_switch > /debug/tracing/available_tracers
  cat /debug/tracing/trace_pipe > trace.txt

( regarding tracing_cpumask: trace only 1 CPU to make sure volanomark is 
  not disturbed too much by many-CPUs tracing. )

	Ingo
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