linux-kernel - Re: [REPORT] cfs-v4 vs sd-0.44

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Date:	Sun, 22 Apr 2007 11:51:37 +1000
From:	Con Kolivas <kernel@...ivas.org>
To:	Willy Tarreau <w@....eu>, ck list <ck@....kolivas.org>
Cc:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.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,
	Gene Heskett <gene.heskett@...il.com>
Subject: Re: [REPORT] cfs-v4 vs sd-0.44

On Saturday 21 April 2007 22:12, Willy Tarreau wrote:
> 2) SD-0.44
>
>    Feels good, but becomes jerky at moderately high loads. I've started
>    64 ocbench with a 250 ms busy loop and 750 ms sleep time. The system
>    always responds correctly but under X, mouse jumps quite a bit and
>    typing in xterm or even text console feels slightly jerky. The CPU is
>    not completely used, and the load varies a lot (see below). However,
>    the load is shared equally between all 64 ocbench, and they do not
>    deviate even after 4000 iterations. X uses less than 1% CPU during
>    those tests.

Found it. I broke SMP balancing again so there is serious scope for 
improvement on SMP hardware. That explains the huge load variations. Expect 
yet another fix soon, which should improve behaviour further :)

-- 
-ck
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