linux-kernel - Re: [patch] CFS scheduler, -v6

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Date:	Sat, 28 Apr 2007 20:58:02 +0530
From:	Srivatsa Vaddagiri <vatsa@...ibm.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Con Kolivas <kernel@...ivas.org>,
	Nick Piggin <npiggin@...e.de>, Mike Galbraith <efault@....de>,
	Arjan van de Ven <arjan@...radead.org>,
	Peter Williams <pwil3058@...pond.net.au>,
	Thomas Gleixner <tglx@...utronix.de>, caglar@...dus.org.tr,
	Willy Tarreau <w@....eu>,
	Gene Heskett <gene.heskett@...il.com>, Mark Lord <lkml@....ca>,
	Zach Carter <linux@...hcarter.com>,
	buddabrod <buddabrod@...il.com>
Subject: Re: [patch] CFS scheduler, -v6

On Sat, Apr 28, 2007 at 08:53:27PM +0530, Srivatsa Vaddagiri wrote:
> With the patch below applied, I ran a "time -p make -s -j10 bzImage"
> test.

On a 4CPU (accounting HT) Intel Xeon 3.6GHz box

> 
> 2.6.20 + cfs-v6			-> 186.45 (real)
> 2.6.20 + cfs-v6 + this_patch	-> 184.55 (real)
> 
> or about ~1% improvement in real wall-clock time. This was with the default 
> sched_granularity_ns of 6000000. I suspect larger the value of
> sched_granularity_ns and the number of (SCHED_NORMAL) tasks in system, better 
> the benefit from this caching.

-- 
Regards,
vatsa
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