On Thu, Apr 09, 2015 at 09:00:43PM -0400, Olivier Crête wrote: > Hello, > > Using an Atom E3845 board, we had a pretty bad performance regression > when upgrading to 4.0-rc6 from 3.19. With the help of git bisect, I > traced it back to commit 78a42377. Reverting this commit and subsequent > related commits (b9ffd80, 71745376, etc) fixes the performance > regression for me. Can you please test http://cgit.freedesktop.org/~ickle/linux-2.6/log/?h=for-olivier-crete on your setup. First http://cgit.freedesktop.org/~ickle/linux-2.6/commit/?h=for-olivier-crete&id=044307a99b418258ac0d775460d73b20b80277c1 to get a baseline with nightly as that contains some fine tuning to the batch allocations, which is pretty significant for libva on Atom (only double clflushing one or two pages every batch rather than 128) and then http://cgit.freedesktop.org/~ickle/linux-2.6/commit/?h=for-olivier-crete&id=0a24802a5b61403b887ce401ce3efd52f5fd1eac to see if the command parser tuning helps. Hope this helps, -Chris -- Chris Wilson, Intel Open Source Technology Centre _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
