On 10/27/2013 07:24 AM, Daniel Vetter wrote: > On Sat, Oct 26, 2013 at 01:07:48PM -0700, Kenneth Graunke wrote: >> These patches add some missing flushing, which appears to help. I'm >> still getting GPU hangs, but they're much less frequent, and now have >> an IPEHR of MI_SEMAPHORE_MBOX. I suspect those may be due to bugs in >> my performance monitoring code, rather than upstream problems. > > The new bug is https://bugs.freedesktop.org/show_bug.cgi?id=54226
Oh, fantastic! I'm glad it's a known issue and not me making things worse... :) Thanks for the pointer. > We can > work around that by disabling semaphores, but that tends to bring the > slightly non-coherent seqno write/irq signalling to light again. Note that > there's been a bunch of kernels that failed to correctly detect the missed > interrupt stuff and instead just stalled for one second. > > Since both bugs can be fixed up by just unblocking the rings (after the > kernel check that indeed semaphores signals/irqs have been lost) and don't > require a full gpu reset we've somewhat stopped bothering. > > If these bugs get in the way of your testing you can clear the error state > by just writing something to the debugfs/sysfs file, making way for the > next gpu hang. Yep, that's a really useful feature. >> Xinkai Chen reported that DOTA 2 used to hang every 8-10 minutes, but >> after applying this patch series, it had not hung after 3 hours. > > Awesome! Afaics the snb blorp death is currently the most often reported > dupe bug we see for gpu hangs reported against the kernel ;-) > >> I'm not sure if these should go to stable or not. Probably, but adding >> more flushes could introduce hangs just as easily as it could fix them >> (at least on Sandybridge), so I'm always nervous about that. > > Most reports I've seen fly by mentioned that stability markedly reduce > when upgrading from mesa 9.1 to 9.2. And these regressions seem to happen > with lots of different gl apps. So imo this should go to stable, but maybe > after an extended soaking time. > > Cheers, Daniel Sounds like a plan. Thanks, Daniel. _______________________________________________ mesa-dev mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/mesa-dev
