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AMDGPU DC Code Improvements Bring Better Page-Flipping
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Originally posted by Azpegath View PostIt's a shame it doesn't get into 5.0, it would be nice to have some clean-ups of the DC as soon as possible. I agree with oleid, there has been many stability issues with DC. I'm running it on a R290, so I guess I'm an outlier (they aren't officially supported, right?) and have to accept some issues, but the kernel didn't even boot for 2 whole main release versions. Now they've fixed the first specific issue I had, but I still haven't tried updating to anything newer than 4.18.20, since there where so many other issues (the filesystem corruption, etc). I think I'm mainly waiting for 5.0.(>5), to not risk hitting any issues.
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Originally posted by tomtomme View PostYup, one problem. I have this bug https://bugzilla.kernel.org/show_bug.cgi?id=201795
I still am at kernel 4.14 because of it.
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It's a shame it doesn't get into 5.0, it would be nice to have some clean-ups of the DC as soon as possible. I agree with oleid, there has been many stability issues with DC. I'm running it on a R290, so I guess I'm an outlier (they aren't officially supported, right?) and have to accept some issues, but the kernel didn't even boot for 2 whole main release versions. Now they've fixed the first specific issue I had, but I still haven't tried updating to anything newer than 4.18.20, since there where so many other issues (the filesystem corruption, etc). I think I'm mainly waiting for 5.0.(>5), to not risk hitting any issues.
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Originally posted by oleid View PostAnyone with DC problems, too? Since DC is merged, I only get black screen (on my 4k screen) during boot. I can disable DC, and then command line works. But well...
I still am at kernel 4.14 because of it.
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Originally posted by oleid View PostAnyone with DC problems, too? Since DC is merged, I only get black screen (on my 4k screen) during boot. I can disable DC, and then command line works. But well...
sudo zypper dup
with
kernel-default 4.20.3-2.1.g4b478de -> 4.20.3-3.1.g4ac37bd
kernel-default-devel 4.20.3-2.1.g4b478de -> 4.20.3-3.1.g4ac37bd
kernel-devel 4.20.3-2.1.g4b478de -> 4.20.3-3.1.g4ac37bd
kernel-syms 4.20.3-2.1.g4b478de -> 4.20.3-3.1.g4ac37bd
It may help me or not?
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Originally posted by tildearrow View PostI have a question only partially related to page-flipping.
Is it possible to disable Adaptive-VSync in Mesa? It seems to be always on and I've been unable to find a way to disable it... (by this I do not mean Adaptive-Sync AKA FreeSync, but rather the technique that disables VSync if the game is running too slow by not waiting for VBlank when swapping but rather doing so on the next command)
just "glxgears" as command gives me "301 frames in 5.0 seconds = 60.001 FPS"
while "vblank_mode=0 glxgears" outputs after a warning "101447 frames in 5.0 seconds = 20289.314 FPS"
There is a second switch in xorg.conf, for the old radeon driver it was:
Option "swapbufferswait" "0"
I don't know what the equivalent is for amdgpu or if it's needed at all
you can add vblank_mode=0 to your environment so all applications start in that mode if you prefer
Last edited by xception; 23 January 2019, 05:19 AM.
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I have a question only partially related to page-flipping.
Is it possible to disable Adaptive-VSync in Mesa? It seems to be always on and I've been unable to find a way to disable it... (by this I do not mean Adaptive-Sync AKA FreeSync, but rather the technique that disables VSync if the game is running too slow by not waiting for VBlank when swapping but rather doing so on the next command)
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Nope. Nothing but benefits. I updated the kernel on elementaryOS from the stupid non-LTS 4.15 that they have to 5.0 and was amazed at how much more performance I now get.
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Anyone with DC problems, too? Since DC is merged, I only get black screen (on my 4k screen) during boot. I can disable DC, and then command line works. But well...
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