Radeon R9 380 performance regression since kernel 4.7rc1

[nadro]

Hello,

Do you know where can I open ticket for an issue with AMDGPU kernel driver? Since kernel 4.7rc1 I see huge performance drop -> 50% on my R9 380 2GB (Sapphire ITX Compact). I hope that kernel 4.8rc1 will solve this issue, however today I checked this kernel and regression is still here. I have Gnome Ubuntu 16.04.

Best regards,
Patryk

[JonathanM]

If it is a kernel issue you could report it here: https://bugzilla.kernel.org/
Here is an example: https://bugzilla.kernel.org/show_bug.cgi?id=119631

[haagch]

It might be better to report on https://bugs.freedesktop.org/ in DRI and then DRM/AMDgpu.

You do get replies on the kernel bugzilla but I heard (?) that developers are more likely to look at the freedesktop bugzilla.

It's a bit unfortunate that there are two different places for the same driver...

[bridgman]

Do you know where can I open ticket for an issue with AMDGPU kernel driver? Since kernel 4.7rc1 I see huge performance drop -> 50% on my R9 380 2GB (Sapphire ITX Compact). I hope that kernel 4.8rc1 will solve this issue, however today I checked this kernel and regression is still here. I have Gnome Ubuntu 16.04.

What are typical before and after frame rates ? There is a ticket open against R9 290 but the issue seems like it could be fairly generic - related to page flips, and seems to be associated with "before regression" frame rates under 60 fps where flip issues can make a real difference.

Another vote for reporting on dri tracker rather than kernel tracker.

Are you using PRO userspace or all-open userspace ?

[dungeon]

There is a ticket open against R9 290 but the issue seems like it could be fairly generic...

There are HD 7970 affected here:

https://bugzilla.kernel.org/show_bug.cgi?id=119631

So with this R9 380 and R9 290 you mentioned, we now have near full spectre rather then generic issue

[dungeon]

Here R9 390 seems isn't affected:

https://bugs.freedesktop.org/show_bug.cgi?id=97260#c2

But on Gentoo and with that first what comes to my might be compilation issue... those guys like to put -march=native everywhere, but easy forget about average Joe's -march=generic

In easy words Temash dual core is for developers and non-Gentoo

[bridgman]

*bridgman ponders the difference between "full spectrum" and "generic"...

[dungeon]

Full spectrum random portable generic

[nadro]

Thanks for all informations (it seems like I have exactly this problem: https://bugs.freedesktop.org/show_bug.cgi?id=97260), I had some issues with new Phoronix site (I had to reset cache on my router) thats why I couldn't reply faster.

At first some benchmarks:
Shadow of Mordor [kernel 4.7] -> min: 12 max 30 avg: 21 / 30 FPS at main menu
Shadow of Mordor [kernel 4.6] -> min: 15 max 64 avg: 32 / 60 FPS at main menu

I didn't save FPS from OpenMW and Metro 2033 (Redux) and Metro LL (Redux), but performance drop was significant (I can't start Metro benchmarks now due to a segfault).

I use full open source stack (mesa-git from Padoka PPA), but I tested with stock Mesa from Ubuntu too. AMDGPU-PRO didn't work with Gnome last time -> black screen.

[nadro]

It looks like that problem was detected and a workaround exists I think that this discussion may be moved to this thread: https://www.phoronix.com/forums/foru...ight-be-nailed
Thanks again everyone for help.