<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW --- - R9270X pyrit benchmark perf regressions with latest kernel/llvm" href="https://bugs.freedesktop.org/show_bug.cgi?id=82050#c8">Comment # 8</a> on <a class="bz_bug_link bz_status_NEW " title="NEW --- - R9270X pyrit benchmark perf regressions with latest kernel/llvm" href="https://bugs.freedesktop.org/show_bug.cgi?id=82050">bug 82050</a> from <a class="email" href="mailto:adf.lists@gmail.com" title="Andy Furniss <adf.lists@gmail.com>"> Andy Furniss</a> <pre>kernel - fb240a2534802a86742db51b7334138675bc435e is the first bad commit commit fb240a2534802a86742db51b7334138675bc435e Author: Michel Dänzer <<a href="mailto:michel.daenzer@amd.com">michel.daenzer@amd.com</a>> 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 safe: * 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 <<a href="mailto:michel.daenzer@amd.com">michel.daenzer@amd.com</a>> Signed-off-by: Alex Deucher <<a href="mailto:alexander.deucher@amd.com">alexander.deucher@amd.com</a>></pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the assignee for the bug.</li> </ul> </body> </html>