<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_RESOLVED bz_closed" title="RESOLVED FIXED - [845G] CPU/GPU incoherency" href="https://bugs.freedesktop.org/show_bug.cgi?id=26345#c153">Comment # 153</a> on <a class="bz_bug_link bz_status_RESOLVED bz_closed" title="RESOLVED FIXED - [845G] CPU/GPU incoherency" href="https://bugs.freedesktop.org/show_bug.cgi?id=26345">bug 26345</a> from <a class="email" href="mailto:chris@chris-wilson.co.uk" title="Chris Wilson <chris@chris-wilson.co.uk>"> Chris Wilson</a> <pre>Now in kernel form as well: commit b75e53bac7f4164e1c53a636352faa3d177b4beb Author: Daniel Vetter <<a href="mailto:daniel.vetter@ffwll.ch">daniel.vetter@ffwll.ch</a>> Date: Sun Dec 16 18:08:07 2012 +0100 drm/i915: Implement workaround for broken CS tlb on i830/845 Now that Chris Wilson demonstrated that the key for stability on early gen 2 is to simple _never_ exchange the physical backing storage of batch buffers I've tried a stab at a kernel solution. Doesn't look too nefarious imho, now that I don't try to be too clever for my own good any more. v2: After discussing the various techniques, we've decided to always blit batches on the suspect devices, but allow userspace to opt out of the kernel workaround assume full responsibility for providing coherent batches. The principal reason is that avoiding the blit does improve performance in a few key microbenchmarks and also in cairo-trace replays. Signed-Off-by: Daniel Vetter <<a href="mailto:daniel.vetter@ffwll.ch">daniel.vetter@ffwll.ch</a>> Signed-off-by: Chris Wilson <<a href="mailto:chris@chris-wilson.co.uk">chris@chris-wilson.co.uk</a>></pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> </ul> </body> </html>