Message-ID: <3F5AD03E.5070506@cyberone.com.au>
Date: Sun, 07 Sep 2003 16:29:18 +1000
From: Nick Piggin <piggin@cyberone.com.au>
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To: Andrew Morton <akpm@osdl.org>
CC: rml@tech9.net, jyau_kernel_dev@hotmail.com, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] Minor scheduler fix to get rid of skipping in xmms
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Andrew Morton wrote:

>Nick Piggin <piggin@cyberone.com.au> wrote:
>
>>So it is quite sad that the scheduler in 2.6 is
>> sitting there doing nothing but waiting to be obsoleted, while Con's
>> good (and begnin) scheduler patches are waiting around and getting
>> less than 1% of the testing they need.
>>
>
>My concern is the (large) performance regression with specjbb and
>volanomark, due to increased idle time.
>
>We cannot just jam all this code into Linus's tree while crossing our
>fingers and hoping that something will turn up to fix this problem. 
>Because we don't know what causes it, nor whether we even _can_ fix it.
>
>So this is the problem which everyone who is working on the CPU scheduler
>should be concentrating on, please.
>

IIRC my (equivalent to Andrew's CAN_MIGRATE) patch fixed this. There was 
still a small (~8%?) performance regression, but idle times were on par 
with -linus. I don't have easy access to a largeish NUMA box, so I
can't do much more.


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