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Re: [Xen-devel] [PATCH] improve x86 page table handling performance

To: Jan Beulich <jbeulich@xxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: Re: [Xen-devel] [PATCH] improve x86 page table handling performance
From: Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
Date: Tue, 27 Mar 2007 08:44:52 +0100
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On 27/3/07 07:22, "Jan Beulich" <jbeulich@xxxxxxxxxx> wrote:

>> The single change to pte_clear() yields a 25-30% boost for kernel builds
>> on a 4x2x2 CPUs, 8Gb box; the other changes together yield improvements
>> of 2-5%.
> I shall clarify that this is for the PAE case only (i.e. resulting from the
> folding of two page faults into a single hypercall, which is being used in the
> kmap path).

Spotted that. The patch is pretty big but I think probably all good. I've
been away for a week so catching up on patches...

 -- Keir

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