Originally posted by ChrisXY
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The AMD Radeon Performance Is Incredible On Linux 3.12
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Originally posted by Rakot View PostWild guess. Could it be the change not related to GPU driver at all? I just remembered the discussion related to ondemand vs performance governor. It was shown by Vadim that ondemand could drop the frame rates. So is it possible that this problem was fixed in 3.12?Michael Larabel
https://www.michaellarabel.com/
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Originally posted by Rakot View PostWild guess. Could it be the change not related to GPU driver at all? I just remembered the discussion related to ondemand vs performance governor. It was shown by Vadim that ondemand could drop the frame rates. So is it possible that this problem was fixed in 3.12?
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Originally posted by Michael View PostI haven't seen any GPU Haswell performance changes out of 3.12 vs. 3.11.
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Originally posted by agd5f View PostPossibly. It could be that the cards were previously CPU limited, and due to some change in 3.12, they are no longer CPU limited. That would explain the larger boost on higher end cards since the lower end cards would already be nearer to being GPU limited.
Michael, can you run just one more test on one of the affected card with 3.11 + performance governor in one of the game which showed dramatic speedup? If the result will be the same as in the case of 3.12 you can safely conclude that this is the reason.
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CPU governor setting still effects framerate the same way here
Originally posted by agd5f View PostPossibly. It could be that the cards were previously CPU limited, and due to some change in 3.12, they are no longer CPU limited. That would explain the larger boost on higher end cards since the lower end cards would already be nearer to being GPU limited.
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I found the CPU Governor definitely affects the smoothness of my laptop with Fglrx. It doesn't really seem to affect benchmarks, but definitely improves gameplay and general desktop responsiveness.
Also the default governor settings from 3.10 onwards seems to have largely improved things for me.
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Originally posted by ChrisXY View PostSomehow I get the impression that cheap gpus run well and expensive ones run bad.
I tried to use the open source driver for my hybrid HD 7970M.
Auto poweroff ("runtime pm") does not seem to be in 3.12 yet. It's pretty important because with vgaswitcheroo if you power off the radeon gpu in X and then go to a tty and then back to X, the driver locks up.
With DPM enabled:
When starting X on boot it locked up with a cursor in the upper left corner. Starting X a little while after boot worked.
When powering off the radeon GPU with vgaswitcheroo X locks up completely.
That's not even performance or features, that's the most basic stuff like not locking up X.
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