https://bugs.freedesktop.org/show_bug.cgi?id=35876
--- Comment #27 from [email protected] 2011-08-30 17:48:40 PDT --- Thanks to Marcin Kościelnicki, I understand now that hung PFIFO dumps were just a consequence of an attempt to execute 'software' command in the command stream. These commands indeed cause PFIFO errors, but that is normal as the error triggers an interrupt and kernel driver handles the error. In this case software command was used to signal a pageflip, and it was issued for every full screen 3d application. However I forgot to mention that I was running kernel nouveau driver with 'msi=1' option, an option that makes hardware use message signaled interrupts that are known to be broken on several systems because of chipsets bugs or else. Due to that in rare case, the interrupt was't delivered to kernel, causing PFIFO to hang waiting for software to service that interrupt. When I disabled the 'msi' option, which is disabled by default, the problem gone and I was able to test run supertuxkart for hour and 50 minutes, and I actually repeated that test few times with different variations, including running with nouveau's ctxprog and compiz. I am quite sure (knocks wood) that problem is gone. A side note is that I was getting hangs on one small webgl demo the http://helloracer.com/webgl/, and I was using older version of mesa because latest had rendering issues (resolved now and believed to be chromium bug actually). That demo generated a lot of PGRAPH errors (doesn't now) and once again since each error triggers an interrupt, eventually same hang would happen. Also running XV, syncs to VBlank and that also involves interrupts, and I had in past several hangs while using XV, so I won't be surprised if that was the cause (I used 'msi' option since it was introduced, and didn't expect this to happen) Thats all, and it seems (knocks wood again) that my card is finally stable. -- Configure bugmail: https://bugs.freedesktop.org/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are the assignee for the bug. _______________________________________________ Nouveau mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/nouveau
