https://bugs.freedesktop.org/show_bug.cgi?id=82050
--- Comment #17 from Michel Dänzer michel@daenzer.net --- (In reply to comment #14)
Yes, with that reverted perf is roughly back to "good" kernel for both.
Can you try restoring the old behaviour for only PIPE_USAGE_DYNAMIC or PIPE_USAGE_STREAM respectively, to see if one of them alone fixes the problem in Valley?