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From: Con Kolivas <kernel@kolivas.org>
To: Willy Tarreau <w@1wt.eu>, ck list <ck@vds.kolivas.org>
Subject: Re: [REPORT] cfs-v4 vs sd-0.44
Date: Sun, 22 Apr 2007 11:51:37 +1000
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Cc: Ingo Molnar <mingo@elte.hu>, linux-kernel@vger.kernel.org,
       Linus Torvalds <torvalds@linux-foundation.org>,
       Andrew Morton <akpm@linux-foundation.org>,
       Nick Piggin <npiggin@suse.de>, Mike Galbraith <efault@gmx.de>,
       Arjan van de Ven <arjan@infradead.org>,
       Peter Williams <pwil3058@bigpond.net.au>,
       Thomas Gleixner <tglx@linutronix.de>, caglar@pardus.org.tr,
       Gene Heskett <gene.heskett@gmail.com>
References: <20070420140457.GA14017@elte.hu> <20070421121235.GA2044@1wt.eu>
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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