Message-ID: <43D5821A.7050001@bigpond.net.au>
Date: Tue, 24 Jan 2006 12:25:46 +1100
From: Peter Williams <pwil3058@bigpond.net.au>
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To: Martin Bligh <mbligh@google.com>
CC: Con Kolivas <kernel@kolivas.org>, Andrew Morton <akpm@osdl.org>,
       linux-kernel@vger.kernel.org, Ingo Molnar <mingo@elte.hu>,
       Andy Whitcroft <apw@shadowen.org>
Subject: Re: -mm seems significanty slower than mainline on kernbench
References: <43C45BDC.1050402@google.com> <43C5BD8F.3000307@bigpond.net.au> <43C5BE4A.9030105@google.com> <200601121739.17886.kernel@kolivas.org> <43D52E6F.7040808@google.com>
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Martin Bligh wrote:
> 
>> Thanks and looks like the results are in from 2.6.14-rc2-mm1 with the 
>> patch backed out.
>>
>> Drumroll....
>>
>> http://test.kernel.org/perf/kernbench.moe.png
>>
>> The performance goes back to a range similar to 2.6.14-rc1-mm1 (see 
>> 2.6.14-rc2-mm1 + 20328 in blue). Unfortunately this does implicate 
>> this patch. Can we put it back into -mm only and allow Peter's 
>> tweaks/fixes to go on top and have it tested some more before going 
>> upstream?
> 
> 
> Hmm. Looks like we didn't get this as fixed up as I thought. Moe seems 
> to be fixed (16x NUMA-Q), but elm3b132 is not (it's 4x, flat SMP ia32).
> Look at the latest graphs ....
> 
> Is it possible it only got fixed for NUMA boxes?

It should be totally independent.

But anyhow, I can't see the problem.  The only numbers that I can see 
for 2.6.16-rc1-mm[1|2] (which are the ones with the latest fix) on this 
graph are approx. 101 which is much the same as the best of the rest. 
Or have I missed something?

Peter
-- 
Peter Williams                                   pwil3058@bigpond.net.au

"Learning, n. The kind of ignorance distinguishing the studious."
  -- Ambrose Bierce
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