linux-kernel - Re: [patch 04/17] Add pagetable accessors to pack and unpack pagetable entries

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Date:	Wed, 04 Apr 2007 09:04:30 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Andi Kleen <ak@...e.de>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	virtualization@...ts.osdl.org, lkml <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [patch 04/17] Add pagetable accessors to pack and unpack pagetable
 entries

Andi Kleen wrote:
> I was talking about the patched case. It seemed to be a little slower
> too, but in theory it shouldn't have been, no? 

Oh, the .25 vs .26?  That's definitely noise; on other runs I see no
difference:

paravirt, patched, busy machine
ezr       Linux 2.6.21- 1000 0.25 0.52 31.3 34.4 12.7 1.02 5.44 743. 1578 4582
ezr       Linux 2.6.21- 1000 0.25 0.53 31.4 34.2 12.1 1.02 5.27 736. 1594 4806
ezr       Linux 2.6.21- 1000 0.25 0.52 31.5 34.4 14.3 1.02 5.49 736. 1587 4601

(I didn't use this result because I did it on a fairly busy machine, but
the best-case numbers are actually somewhat better than the run on a
completely quiet machine.)


    J
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