[Bug 31532] New: rv670 AGP gart + gallium - GPU lockups. PCIE gart runs but stalls.

[bugzilla-daemon at freedesktop.org]

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 at lists.freedesktop.org
        ReportedBy: lists at 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.

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