linux-kernel - Re: BFS vs. mainline scheduler benchmarks and measurements

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Date:	Mon, 7 Sep 2009 22:57:01 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Michael Buesch <mb@...sch.de>
Cc:	Con Kolivas <kernel@...ivas.org>, linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Mike Galbraith <efault@....de>, Felix Fietkau <nbd@...nwrt.org>
Subject: Re: BFS vs. mainline scheduler benchmarks and measurements


* Michael Buesch <mb@...sch.de> wrote:

> On Monday 07 September 2009 20:26:29 Ingo Molnar wrote:
> > Could you profile it please? Also, what's the context-switch rate?
> 
> As far as I can tell, the broadcom mips architecture does not have 
> profiling support. It does only have some proprietary profiling 
> registers that nobody wrote kernel support for, yet.

Well, what does 'vmstat 1' show - how many context switches are 
there per second on the iperf server? In theory if it's a truly 
saturated box, there shouldnt be many - just a single iperf task 
running at 100% CPU utilization or so.

(Also, if there's hrtimer support for that board then perfcounters 
could be used to profile it.)

	Ingo
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