[Bug 97260] [bisected] R9 290 low performance in Linux 4.7

[bugzilla-daemon at freedesktop.org]

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

--- Comment #22 from Kai <kai at dev.carbon-project.org> ---
(In reply to Michel Dänzer from comment #21)
> Created attachment 125838
> loader/dri3: Always use 3 back buffers when flipping
> 
> Does this Mesa patch help?

Yes! With attachment 125838 applied on top of Mesa master 607ab6d3bf I'm seeing
the same performance on 4.7.1 as on 4.6.4.
You can have my
 Tested-by: Kai Wasserbäch <kai at dev.carbon-project.org>

The full stack used (Debian testing as a base) was:
GPU: Hawaii PRO [Radeon R9 290] (ChipID = 0x67b1)
Mesa: Git:master/3fb4a9b3b3 / Git:master/607ab6d3bf + attachment 125838
libdrm: 2.4.70-1
LLVM: SVN:trunk/r278555 (4.0 devel)
X.Org: 2:1.18.4-1
Linux: 4.7.1
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

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