Linux+Mesa Git Remains Problematic For Some Regressed R9 290 GPUs

Last week a Mesa fix landed to target the Radeon R9 290/390 performance regression that's been covered a few time on Phoronix since the issue was originally noticed. While the Mesa fix is working for some users, it didn't fix all problems, including with my Hawaii test card.

Some users reported that the latest Mesa Git has fixed their issue with select problematic Radeon GPUs regressing with very slow performance while others have said their issues still persist. On a Radeon R9 290, I tried out the latest Mesa Git (with the newest Padoka PPA, updated on Monday) as well as Linux 4.8 Git. Unfortunately, for my Radeon R9 290, the performance is still heavily regressed...




No real change with this newest Linux and Mesa code compared to a known faulty state for this R9 290 system from a few weeks ago... For just how bad the regression is:



Ouch.