linux-kernel - Re: [Bug 10328] New: [regression] performance drop for glx

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Date:	Tue, 25 Mar 2008 15:28:09 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>
Cc:	bugme-daemon@...zilla.kernel.org, linux-kernel@...r.kernel.org,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: [Bug 10328] New: [regression] performance drop for glx

(switched to email.  Please respond via emailed reply-to-all, not via the
bugzilla web interface).

On Tue, 25 Mar 2008 15:11:15 -0700 (PDT)
bugme-daemon@...zilla.kernel.org wrote:

> http://bugzilla.kernel.org/show_bug.cgi?id=10328
> 
>            Summary: [regression] performance drop for glx
>            Product: Memory Management
>            Version: 2.5
>      KernelVersion: 2.6.25-rc6
>           Platform: All
>         OS/Version: Linux
>               Tree: Mainline
>             Status: NEW
>           Severity: normal
>           Priority: P1
>          Component: Other
>         AssignedTo: akpm@...l.org
>         ReportedBy: bug-track@...her-privat.net
> 
> 
> after commit 4138cc3418f5eaa7524ff8e927102863f1ba0ea5 i expirience some grafik
> related perfomance issues.
> 
> I used glxgears for test.
> before this patch: 1281.005 FPS
> and after: 765.000 FPS

It nearly halved.

> latest tested commit a4083c9271e0a697278e089f2c0b9a95363ada0a
> still hase bad performance.
> 
> I use Pentium D with 2GB RAM, Grafick: i945G, ICH7
> 

That's 

: commit 4138cc3418f5eaa7524ff8e927102863f1ba0ea5
: Author: Siddha, Suresh B <suresh.b.siddha@...el.com>
: Date:   Wed Jan 30 13:33:43 2008 +0100
: 
:     x86: set strong uncacheable where UC is really desired
:     
:     Also use _PAGE_PWT for all the mappings which need uncache mapping.
:     Instead of existing PAT2 which is UC- (and can be overwritten by MTRRs),
:     we now use PAT3 which is strong uncacheable.
:     
:     This makes it consistent with pgprot_noncached()
:     
:     Signed-off-by: Suresh Siddha <suresh.b.siddha@...el.com>
:     Signed-off-by: Ingo Molnar <mingo@...e.hu>
:     Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
: 

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