xf86-video-intel 2.5.0 performance questions

elupus elupus at ecce.se
Tue Oct 21 13:52:50 PDT 2008

On Tue, 21 Oct 2008 22:33:35 +0200, Halim Issa wrote:

> Hello,
> I'm seeing some unexpectedly poor performance with version 2.5.0 of the Intel 
> driver on Xorg X Server 1.5.1 with libdrm 2.4.0 and mesa 7.2. The system in 
> question is a Lenovo X200 laptop with Intel Graphics Media Accelerator 4700 
> MHD onboard graphics card.
> glxgears reports it "Failed to initialise TTM buffer manager. Falling back to 
> classic" and then gives a steady 301 frames per 5.0 seconds = 60.103 FPS.
> I know full well that glxgears is not a 100% accurate tool for benchmarking 
> performance, but the poor performance is also clear in all aspects of graphic 
> processing.
> I have not made any special/custom tweaks to my xorg.conf (attached) and have 
> also not made any special/custom ./configure --options to the intel driver 
> while compiling.
> In trying to research this I have googled some rather broad queries that have 
> not provided any useful data. I would thus greatly appreciate if someone 
> could kindly point me towards relevant information on the subject so that I 
> can identify and fix the problem.
> Attached is my xorg.conf and Xorg.0.log files.
> Thanks much in advance. Any insight and pointers to enable me to further 
> understand what's wrong (and hopefully how to fix) would be greatly 
> appreciated!

Vsync is on.. Ie it won't allow you to display more than your displays
frame rate. (it's on by default on newer drivers). run it with:
vblank_mode=0 glxgears
and see what you get.

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