[Bug 82050] R9270X pyrit benchmark perf regressions with latest kernel/llvm

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Tue Aug 5 16:23:26 PDT 2014


--- Comment #8 from Andy Furniss <adf.lists at gmail.com> ---
kernel -

fb240a2534802a86742db51b7334138675bc435e is the first bad commit
commit fb240a2534802a86742db51b7334138675bc435e
Author: Michel Dänzer <michel.daenzer at amd.com>
Date:   Thu Jul 31 18:43:49 2014 +0900

    drm/radeon: Always flush the HDP cache before submitting a CS to the GPU

    This ensures the GPU sees all previous CPU writes to VRAM, which makes it

    * For userspace to stream data from CPU to GPU via VRAM instead of GTT
    * For IBs to be stored in VRAM instead of GTT
    * For ring buffers to be stored in VRAM instead of GTT, if the HPD flush
      is performed via MMIO

    Signed-off-by: Michel Dänzer <michel.daenzer at amd.com>
    Signed-off-by: Alex Deucher <alexander.deucher at amd.com>

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