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[Xen-devel] Re: [PATCH] fxsave/fxrstor adjustments

from [Keir Fraser] [Permanent Link][Original]
To: Andi Kleen <ak@xxxxxxx>
Subject: [Xen-devel] Re: [PATCH] fxsave/fxrstor adjustments
From: Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
Date: Tue, 25 Apr 2006 08:51:31 +0100
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On 25 Apr 2006, at 01:56, Andi Kleen wrote:


On K7/K8 emms and ffree st(7) are the same performance. On P4 ffree is
much faster. The Linux 2.6 patch uses emms because it patches the code
in only on K7/K8. For the Xen patch that's ok too although it checks,
not patches. In Linux 2.4 where the code is executed unconditionally
ffree is used.

An earlier version of the AMD workaround used emms always until
the P4 emms performance issue was discovered.


Thanks Andi.

 -- Keir


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