[Bug 34332] New: [r300g, bisected] HoN: corruption with tiling and CS ioctl thread offloading

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=34332

           Summary: [r300g, bisected] HoN: corruption with tiling and CS
                    ioctl thread offloading
           Product: Mesa
           Version: git
          Platform: Other
        OS/Version: All
            Status: NEW
          Keywords: regression
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/r300
        AssignedTo: dri-devel at lists.freedesktop.org
        ReportedBy: pavel.ondracka at email.cz


Created an attachment (id=43425)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=43425)
screenshot

There is corruption in Heroes of Newerth menu and also ingame.

b9e2cde6006b557a3a23a82384899f4d5a5ac7b8 is the first bad commit
commit b9e2cde6006b557a3a23a82384899f4d5a5ac7b8
Author: Marek Olšák <maraeo at gmail.com>
Date:   Tue Feb 15 05:43:44 2011 +0100

    r300g: offload the CS ioctl to another thread

    This is a multi-threading optimization which hides the kernel overhead
    behind a thread. It improves performance in CPU-limited apps by 2-15%.
    Of course you must have at least 2 cores for it to make any difference.

    It can be disabled with:

    export RADEON_THREAD=0

RADEON_THREAD=0 or RADEON_DEBUG=notiling solves this bug.

The screenshot is taken without libtxc_dxtn. The corruption is much better when
libtxc_dxtn is present, but not completely gone.

GPU: RV530
mesa: f53436d821a5173075b2a4a8db8cd23d9669f6e2
kernel: 2.6.37

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