On 19.06.2014 18:45, Christian König wrote: > Am 19.06.2014 03:48, schrieb Michel Dänzer: >> On 15.06.2014 21:48, Christian König wrote: >>> >>> No idea what goes wrong when Marek runs piglit, but 3.15.0+"stop >>> poisoning the GART TLB"+"force_gtt" is rock solid here. >> FWIW, 3.15 doesn't survive piglit on my Bonaire either, but 3.14 is >> fine. 3.15 seems stable on Kaveri though, but I haven't tried the >> force_gtt patch on that yet. > > Yeah, I think it's just me who has a stable system with 3.15 and that > annoys me quite a bit. FWIW though, my Kaveri doesn't always survive piglit either, e.g. this morning it didn't once again, then did after a reboot. (That's using SDMA; Kaveri was never switched back to CPDMA) > No idea what's the difference. What versions of LLVM/Mesa/Piglit are you > using for the test? Current Git of everything. >> There have also been a number of bug reports about stability regressions >> in 3.15 on various SI and CIK cards. It seems likely that at least some >> of those are related to this issue as well. >> >> If we can't figure out the problem soon, we probably need to revert the >> 'Use normal BOs for page tables' and dependent changes at least for >> 3.15.y? > > I thought about this for the whole 3.15 release cycle, but decided > against it. But what we could do is applying the attached trivial patch, > it pins down the page tables and so pretty much reverts to the old > behavior. This patch applied on top of 3.15 + stop poisoning the GART TLB doesn't seem to help on my Bonaire, unfortunately. > I think even when we revert to the old code we have a couple of unsolved > problems with the VM support or in the driver in general where we should > try to understand the underlying reason for it instead of applying more > workarounds. I'm not suggesting applying more workarounds but going back to a known more stable state. It seems like we've maneuvered ourselves to a rather uncomfortable position from there, with no clear way to a better place. But if we basically started from the 3.14 state again, we have a few known hurdles like mine and Marek's Bonaire etc. which we know any further improvements will have to pass before they can be considered for general consumption. -- Earthling Michel Dänzer | http://www.amd.com Libre software enthusiast | Mesa and X developer _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
