[Bug 97260] R9 290 low performance in Linux 4.7

[bugzilla-daemon at freedesktop.org]

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

Kai <kai at dev.carbon-project.org> changed:

           What    |Removed                     |Added
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                 CC|                            |kai at dev.carbon-project.org

--- Comment #7 from Kai <kai at dev.carbon-project.org> ---
I can confirm this issue with 4.7.0 (vs. 4.6.4 in my case). In XCOM 2 I'm
losing a third in FPS (down to <= 19 FPS from 26-29 FPS with 4.6.4, "measured"
with Gallium's HUD) or about a fifth in The Talos Principle 64 bit (down to 43
Avg FPS from 53 Avg FPS, measured by the benchmark of TTP when run for 60
seconds). The only change between these numbers is the different kernel (and
that's with all the VM faults I'm seeing for XCOM 2 with 4.6.4 on occasion and
haven't been able to reproduce with 4.7.0 yet).

The stack I'm using (Debian testing as a base) is:
GPU: Hawaii PRO [Radeon R9 290] (ChipID = 0x67b1)
Mesa: Git:master/3fb4a9b3b3
libdrm: 2.4.70-1
LLVM: SVN:trunk/r277307 (4.0 devel)
X.Org: 2:1.18.4-1
Linux: 4.6.4 / 4.7.0
Firmware: Git:master/c170c8d957 (placed in /lib/firmware/updates; fallback
would be firmware-amd-graphics/20160110-1)
libclc: Git:master/785bfd3719
DDX: 1:7.7.0-1

I'm not going to be able to do a bisect before the weekend and even then I
don't have high hopes, since the last time I tried bisecting the kernel all the
merge commits screwed me over and I was unable to find a single offending
commit.

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