| Summary: | MesaLib 7.2 downgrades the performance on i965GM | ||
|---|---|---|---|
| Product: | Mesa | Reporter: | Vlad Glagolev <enqlave> |
| Component: | Drivers/DRI/i965 | Assignee: | Gordon Jin <gordon.jin> |
| Status: | RESOLVED NOTABUG | QA Contact: | |
| Severity: | critical | ||
| Priority: | medium | CC: | ixevix |
| Version: | unspecified | ||
| Hardware: | Other | ||
| OS: | All | ||
| Whiteboard: | |||
| i915 platform: | i915 features: | ||
| Attachments: |
xorg.conf
Xorg.conf |
||
Created attachment 19781 [details]
Xorg.conf
I have the same problem on xorg-server-1.3.0.0-r6, mesa-7.2, libdrm-2.3.1, xf86-video-i810-2.4.2-r3 on gentoo.
Quake 3 Arena is down to 4fps from playable ~40-50fps.
Kernel is 2.6.25-gentoo-r8
Vlad, could you try setting vblank_mode to 0 in your ~/.drirc, such as
<driconf>
<device screen="0" driver="i965">
<application name="Default">
<option name="vblank_mode" value="0" />
</application>
</device>
</driconf>
Thanks for damn fast response, Gordon! :) Yeah, it works! I've just rebuilt mesalib and the gxlgears' fps grow up from 55 to maximum 648 fps. But this is with xorg-server 1.4.2. Trying to build new xorg-server (1.5.2) with mesalib 7.2 atm. Well done. Maximum is still ~650, while with xorg-server (1.4.2) + mesalib (7.0.4) I have ~890 fps. Setting vblank_mode to 0 and upgrading to xorg-server-1.4.2 fixed the performance issue! Thanks for the workaround! So I'm closing this. The explanation is the default vblank_mode value changed recently (the old default value is 0), so it's not a true performance downgrade, but a configuration change. (In reply to comment #6) > So I'm closing this. > The explanation is the default vblank_mode value changed recently (the old > default value is 0), so it's not a true performance downgrade, but a > configuration change. > But what about ~900 -> ~650 ? (In reply to comment #7) > But what about ~900 -> ~650 ? mesa-7.2 gets into TTM-classic mode. It doesn't make much sense to compare performance with classic mode. I'd suggest to hold on until GEM (a new memory manager) landed. Besides, glxgears is not a good benchmark. (In reply to comment #8) > mesa-7.2 gets into TTM-classic mode. It doesn't make much sense to compare > performance with classic mode. I'd suggest to hold on until GEM (a new memory > manager) landed. Understood. > Besides, glxgears is not a good benchmark. At least when I see the downgrade of FPS in glxgears -- I feel the same in Nexuiz :) Thanks a lot for explanation! |
Use of freedesktop.org services, including Bugzilla, is subject to our Code of Conduct. How we collect and use information is described in our Privacy Policy.
Created attachment 19756 [details] xorg.conf Updating the stuff (xorg-server, mesalib, libdrm, xf86-video-intel) from old (1.4.2, 7.0.4, 2.3.0, 2.3.2) to new (1.5.2, 7.2, 2.3.1, 2.4.2) killed the performance of all. While launching glxgears I had ~900 fps with my card, now -- not more than 59. I tried to play with the components: built git-based dri kernel module -- nothing's changed; tried to compile xorg-server 1.4.2 with mesalib 7.2 -- nothing's changed; compiled the latest xf86-video-intel driver (2.4.98.0) -- nothing's changed. Even with the different versions of xorg-server. I also played with some driver's options in xorg.conf -- no changes at all. I also noticed the filesize of /usr/lib/dri/i965_dri.so. With mesalib 7.0.4 -- it's around 14 megabytes; with 7.2 -- only ~1.5 megabytes. The most known "feature" of "7.0.4 => 7.2" process is full support of i965 chipsets afaik :) So it broke the performance too much. Everything's tested with Linux kernels 2.6.27.2 and 2.6.24.7 -- no differences. But only when I install mesalib 7.0.4 instead of 7.2 -- fps grow up to ~900. p.s. xorg.conf that I've been using all the time (since nov'07 afaik) attached.