https://bugs.freedesktop.org/show_bug.cgi?id=31532

Summary: rv670 AGP gart + gallium - GPU lockups. PCIE gart runs but stalls. Product: Mesa Version: git Platform: Other OS/Version: All Status: NEW Severity: normal Priority: medium Component: Drivers/Gallium/r600 AssignedTo: dri-devel@lists.freedesktop.org ReportedBy: lists@andyfurniss.entadsl.com

Running d-r-t kernels, xserver 1.9 and git mesa, ddx, lib drm.

Any non trivial mesa demo with r600g will cause a gpu lockup/reset unless I use PCIE gart and turn off writebacks.

Tiling on/off makes no difference.

Not a regression AFAICT, this box was retired a while back, before 600g was really usable, so I don't have and have been unable to find a time when it ever worked.

Classic KMS + AGP gart works OK.

Both Classic KMS and Gallium with agpmode=-1 have stalling problems.

Classic runs demos fine, but will stall for 1/2 sec on some games and some levels eg. openarena anholt is OK but other levels will stutter a bit. These do not show with latencytop.

Classic + UMS does not stall.

Gallium has far worse stalling problems than classic.

Some mesa demos will stall, gearbox shows the most - up to a second when running sometimes more at start. Latency top will show gallium stalls -

radeon_fence_wait often shows 488ms but never more.

Long stalls such as when starting games/demos seem to be in -

radeon_cs_ioctl I have seen 3000ms for games and 1000ms for demos.

Openarena anholt demo 600g behaves strangely - it will stall so much while loading and rendering the first few frames that this takes minutes. After this the demo will run at full speed to completion (sometimes stalls again midway). Benchmark results have shown it took 8 seconds to render one of the early frames - 840 frames 45.0 seconds 18.7 fps 7.0/53.5/8004.0/23.7 ms.