Date: Sun, 07 Sep 2003 07:32:05 -0700
From: "Martin J. Bligh" <mbligh@aracnet.com>
To: Nick Piggin <piggin@cyberone.com.au>, 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
Message-ID: <170520000.1062945124@[10.10.2.4]>
In-Reply-To: <3F5AD03E.5070506@cyberone.com.au>
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> 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.

The degredations were seen on SMP (though I can also see them on NUMA).
You should be able to get access to a largish SMP (or even NUMA) box
via OSDL. Alternatively, I should be able to run some tests on Monday,
once the power is back in our lab (grrrr). Sounds like test order of
the day is:

test4
test4 + "Andrew's patch" (whatever that was, and whichever Andrew ;-))
test4 + Andrew + Con
test4 + Andres + Nick.

Though the results weren't as extreme on my machine, they were 10% or
so, and I can probably beat jbb into running fairly easily, or Mark
can do that one.

M.

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