Bug 110211

Summary:	[regression bisected] amdgpu Fury X Unplayable Slow Down on Dota 2
Product:	Drivers	Reporter:	Kevin McCormack (harlemsquirrel)
Component:	Video(DRI - non Intel)	Assignee:	drivers_video-dri
Status:	NEW ---
Severity:	normal	CC:	harlemsquirrel, mike
Priority:	P1
Hardware:	x86-64
OS:	Linux
Kernel Version:	4.4-rc4	Subsystem:
Regression:	Yes	Bisected commit-id:

Description Kevin McCormack 2016-01-01 01:49:57 UTC

OK, so I tested the 4.4-rc4 kernel and all was well from what I could see with dmseg and steam. However, Dota 2 is REALLY slow while it worked well with the 4.3 kernel. Left 4 Dead 2 and regular usage seems fine. 

I am trying to bisect now but am running into compile issues while bisecting with Arch Linux. Here is my post that forum. 
https://bbs.archlinux.org/viewtopic.php?id=206660

I tested rc5, rc6, and now rc7 with no improvement. The 4.3.3 kernel that was updated in Arch Linux today works well.

Comment 1 Kevin McCormack 2016-01-01 02:06:47 UTC

System info
Software versions:
    4.4.0-rc7
    OpenGL version string: 3.0 Mesa 11.1.0

GPU hardware:
    OpenGL renderer string: Gallium 0.4 on AMD FIJI (DRM 3.1.0, LLVM 3.7.0)
    01:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Fiji XT [Radeon R9 FURY X] [1002:7300] (rev c8)

CPU hardware:
    x86_64
    AMD FX-8370 Eight-Core Processor

Comment 2 Mike Lothian 2016-01-01 11:14:56 UTC

It's not a regression, you'll need to get a kernel from drm-next (with amdgpu.powerplay=1 set) or a kernel from the powerplay branch in order to get your card to clock to its maximum frequencies during gaming. Equally you could wait for kernel 4.5-rc1 to be released

Comment 3 Kevin McCormack 2016-01-01 14:05:57 UTC

Then why I'd it playable with 4.3? I know there is no power management until 4.5

Comment 4 Kevin McCormack 2016-01-01 20:32:53 UTC

OK, I was finally able to bisect today and it looks like the culprit is...

a7ca8ef93001eaab4c5c7f4f3accfbe6ffcf5f26 is the first bad commit
commit a7ca8ef93001eaab4c5c7f4f3accfbe6ffcf5f26
Author: Flora Cui <Flora.Cui@amd.com>
Date:   Mon Nov 2 14:27:45 2015 +0800

    drm/amdgpu: update Fiji's Golden setting
    
    Change-Id: Ic3f3bfce4767cc05d04f6eb24e22a0f3e7ceacaa
    Signed-off-by: Flora Cui <Flora.Cui@amd.com>
    Reviewed-by: Jammy Zhou <Jammy.Zhou@amd.com>

:040000 040000 0a2e67919fcc78b23e7ab7b9fa5978666aeab8cd 62f5595003bf498122fcbc5b65e3d7213a9d1e5a M	drivers

Comment 5 Kevin McCormack 2016-01-08 22:58:51 UTC

Well, it seems that things are much better with 4.4rc8! I'm not sure why. It could also be the new Mushkin RAM I installed. I was having a lot of other random issues with my G.Skill Ares kit like lots of build errors and random system freezes. I'll test this kernel out more this weekend.