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

https://bugs.freedesktop.org/show_bug.cgi?id=82050

--- Comment #28 from Andy Furniss adf.lists@gmail.com --- (In reply to comment #27)

(In reply to comment #26)

...

No difference with those.

Bummer, thanks for testing anyway.

I submitted the change reverting the behaviour of PIPE_USAGE_STREAM for review, but it's strange: I couldn't notice any significant difference in stutter in Valley regardless of any of these changes.

BTW, what CPU are you using?

It's an AMD Phenom II x4 965be.

I always set cpufreq ondemand to perf when testing so it's forced @ 3.4GHz.

When I noticed that ffmpeg x11grab made the pauses "normal" length I did try a different test with cpus loaded by compiling, but this didn't do it.