linux-kernel - Re: [regression] glx performance drop with: "x86: PAT: implement track/untrack of pfnmap regions for x86

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Date:	Tue, 06 Jan 2009 10:52:09 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Alexey Fisher <bug-track@...her-privat.net>
CC:	kernel-testers-owner@...r.kernel.org, linux-kernel@...r.kernel.org,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Venkatesh Pallipadi <venkatesh.pallipadi@...el.com>
Subject: Re: [regression] glx performance drop with: "x86: PAT: implement
 track/untrack of pfnmap regions for x86 - v3"

Alexey Fisher wrote:
> glx perfomance regression after this patch.
> goot kernel: glxgears = 1400 fps
> bad kernel: glxgears = 300 fps ( same speed with disabled drm module )
> 
> kernel log:
> glxgears:5775 map pfn expected mapping type write-back for
> d1000000-d1c80000, got uncached-minus
> glxgears:5775 freeing invalid memtype d1000000-d1c80000
> 

Have we caught a case of actual overlap, i.e. a driver bug here?

	-hpa
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