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Date: Sun, 02 Mar 2003 13:58:58 -0800
From: "Martin J. Bligh" <mbligh@aracnet.com>
To: William Lee Irwin III <wli@holomorphy.com>
cc: linux-kernel@vger.kernel.org
Subject: Re: percpu-2.5.63-bk5-1 (properly generated)
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> There's a relatively large (12s/44s == 27%) difference between absolute
> timings on our machines, which suggests a large disturbance in the force.
> 2.5.63-bk5 virgin appears to get timings in the low 40's.

Did you actually read the previous email? 
Same config file? Same tree? same compiler (gcc 2.95.4?)

>> Would be useful if you can grab a before and after profile, and see exactly
>> what it is that's getting thrashed that you're fixing (may just be everything).
> 
>> From the profile posted it's the division in page_zone().

I think we're talking about different things:

1. Need to isolate what's causing the 6s improvement you're seeing.
Can you generate profiles & time output for before and after the patch,
and describe the test you're running (presumably make -j).

2. SDET degredation. I'll try the additional patch you sent out on that.

M.