Bug 39321

Summary:	[sna kde] swrast on common paths?
Product:	xorg	Reporter:	Alexander <alex.vizor>
Component:	Driver/intel	Assignee:	Chris Wilson <chris>
Status:	RESOLVED FIXED	QA Contact:	Xorg Project Team <xorg-team>
Severity:	major
Priority:	medium	CC:	alex.vizor, eugeni
Version:	7.6 (2010.12)	Keywords:	NEEDINFO
Hardware:	Other
OS:	Linux (All)
Whiteboard:
i915 platform:		i915 features:

Description Alexander 2011-07-18 01:44:51 UTC

I've noticed that Xorg with intel DDX with enabled SNA consumes 20-40% CPU or even more, I've seen 80%. This happens on window switch or on konsole tab switch with 3D effects and without.

"perf top" shows that most resources used by: __kmalloc, page_fault and __memcpy_ssse3. Where __memcpy_ssse3 is on top.

I've built DDX from git. I'm using vanila kernel from git 3.0.0-rc7+ and Debian linux with installed xorg and mesa following versions:
ii  xserver-xorg                        1:7.6+7server
ii  xserver-xorg-core                   2:1.10.2.902-1
ii  libgl1-mesa-dri                     7.11~0-2
ii  libgl1-mesa-glx                     7.11~0-2
ii  libglu1-mesa                        7.11~0-2

Please let me know if I can help more with investigating this issue.

Comment 1 Chris Wilson 2011-07-18 02:27:16 UTC

I need the callgraph to see which paths are hitting sw. In all likelihood it is probably just due to KDE being silly and not using RENDER.

Comment 2 Eugeni Dodonov 2011-09-02 06:14:04 UTC

@Alexander, could you generate a callgraph using callgrind for example?

E.g., like explained at http://docs.kde.org/stable/en/kdesdk/kcachegrind/using-kcachegrind.html and http://valgrind.org/docs/manual/cl-manual.html..

It is hard to say what happens, kmalloc, page_fault and memcpy are probably always the top ones, but to see why the performance is grim we need to know who calls them via what code paths :).

Thanks!

Comment 3 Eugeni Dodonov 2011-10-03 08:10:16 UTC

Ping?

Comment 4 Alexander 2011-10-03 08:23:08 UTC

Hi,

Sorry for delay, now seems it works OK.

Best regards,
Alex

On 10/03/2011 06:10 PM, bugzilla-daemon@freedesktop.org wrote:
> https://bugs.freedesktop.org/show_bug.cgi?id=39321
>
> Eugeni Dodonov<eugeni@dodonov.net>  changed:
>
>             What    |Removed                     |Added
> ----------------------------------------------------------------------------
>             Keywords|                            |NEEDINFO
>
> --- Comment #3 from Eugeni Dodonov<eugeni@dodonov.net>  2011-10-03 08:10:16 PDT ---
> Ping?
>

Comment 5 Eugeni Dodonov 2011-10-03 09:52:48 UTC

Closing then, thanks!

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