Alex Deucher schrieb: > 2010/6/4 Marius Gröger <marius.groeger@xxxxxxxxxxxxxx>: >> Hi All, >> >> Michel Dänzer schrieb: >>> On Mit, 2010-06-02 at 08:07 +0200, Marius Gröger wrote: >>>> Hello All, >>>> >>>> I'm trying the top-of-trunk drm-2.6 trees (both drm-next and >>>> drm-radeon-testing) with my Radeon HD 3200 GPU over HDMI. The primary >>>> application is mythtv which uses DRM syncing for the frame >>>> syncronisation. Now, with the exact same userland software I noticed the >>>> introduction of sync gliches in the May-timeframe. The >>>> drm-radeon-testing on May 9 was still ok, but both drm-next and >>>> drm-radeon-testing at the end of May showed that glitch: every couple of >>>> seconds there's a very visual hickup, especially in scroll texts. >>>> >>>> Apologies for such an unspecific description, and for what almost seems >>>> like a support request for MythTV. I wouldn't post here if I were not >>>> 100% sure it must be related with the recent drm changes. >>> Note that the DRM APIs are intended for use by userspace components of >>> graphics drivers / API libraries, not applications directly. MythTV >>> shouldn't use the DRM directly for synchronization but rather use GLX >>> synchronization APIs. >> What about that new dri2 vsync stuff which was mentioned related to [Bug >> 28383]? Could the changes done for that in any way alter the timing? BTW >> I measured the glitches I'm experiencing and the appear to be to happen >> in intervals of 10 seconds. Again, all I'm changing is the kernel, and >> even the kernel config is the same. I'd be most grateful for any >> clues/hints/tips I could follow to resolve this regression. >> >>> If you have dynamic PM enabled, does disabling that help? >> I checked again and there's method=profile and profile=default. Afaict >> this is not using dynpm, right? >> > > Correct. Ok so with dynpm more or less ruled out, what could have such a visible impact on the latencies? For instance, are we now more dependent (or less) on some kind of interrupt or deferred processing than 6 weeks ago? Btw, I have HDMI audio pretty much ruled out as well. Thanks Marius _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
