On 10.12.2014 06:39, Andy Lutomirski wrote: > On Tue, Dec 9, 2014 at 8:06 AM, Andy Lutomirski <luto at amacapital.net> > wrote: >> On Tue, Dec 9, 2014 at 1:18 AM, Michel Dänzer <michel at daenzer.net> wrote: >>> On 09.12.2014 09:24, Andy Lutomirski wrote: >>>> >>>> The relevant line from latencytop seems to be: >>>> >>>> 154 20441402 489139 radeon_fence_default_wait [radeon] >>>> fence_wait_timeout ttm_bo_wait [ttm] ttm_bo_move_accel_cleanup [ttm] >>>> radeon_move_blit.isra.12 [radeon] radeon_bo_move [radeon] >>>> ttm_bo_handle_move_mem [ttm] ttm_bo_evict [ttm] ttm_mem_evict_first >>>> [ttm] ttm_bo_mem_space [ttm] ttm_bo_validate [ttm] >>>> radeon_bo_fault_reserve_notify [radeon] >>> >>> Which process is this? >> >> Xorg >> >>> >>> Looks like CPU access to a BO in VRAM, but the BO is located outside of >>> the CPU visible area of VRAM, so it has to be moved into the CPU visible >>> area first. >>> >>> Which version of Mesa are you using? >>> >> >> mesa-dri-drivers-10.3.3-1.20141110.fc20.x86_64 >> >> I'm planning on upgrading to Fedora 21 fairly soon. > > Upgrading to mesa-dri-drivers-10.3.3-1.20141110.fc21.x86_64 seems to > have helped enough that my usual test (open a couple of Firefox tabs > with graphics in them) doesn't hang anymore.
Hmm, since that looks like the exact same upstream version, maybe it was actually upgrading something else that made the difference? > This card still isn't *fast*. I'm afraid it wasn't exactly a high-end card even when it was new. What kind of operations are slow? > Is there some way I can check that I'm actually using all 16 PCIe lanes? > In my tinkering w/ power management settings, I got some odd logs > suggesting that only one lane was in use. You can try forcing off ASPM with radeon.aspm=0, other than that I'm not sure. > But I'm still waiting for the day that buggy userspace *can't* cause > kernel graphics stalls. Actually, this looks more like buggy userspace stalling itself. :) -- Earthling Michel Dänzer | http://www.amd.com Libre software enthusiast | Mesa and X developer
