From mboxrd@z Thu Jan 1 00:00:00 1970 From: bugzilla-daemon@freedesktop.org Subject: [Bug 101182] Reading amdgpu_pm_info causes stutter with Linux 4.12-rc Date: Thu, 25 May 2017 06:59:12 +0000 Message-ID: Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============0228703849==" Return-path: Received: from culpepper.freedesktop.org (culpepper.freedesktop.org [IPv6:2610:10:20:722:a800:ff:fe98:4b55]) by gabe.freedesktop.org (Postfix) with ESMTP id 82BD46E8AD for ; Thu, 25 May 2017 06:59:12 +0000 (UTC) List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" To: dri-devel@lists.freedesktop.org List-Id: dri-devel@lists.freedesktop.org --===============0228703849== Content-Type: multipart/alternative; boundary="14956955520.26622d.19995"; charset="UTF-8" --14956955520.26622d.19995 Date: Thu, 25 May 2017 06:59:12 +0000 MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: http://bugs.freedesktop.org/ Auto-Submitted: auto-generated https://bugs.freedesktop.org/show_bug.cgi?id=3D101182 Bug ID: 101182 Summary: Reading amdgpu_pm_info causes stutter with Linux 4.12-rc Product: DRI Version: DRI git Hardware: Other OS: All Status: NEW Severity: normal Priority: medium Component: DRM/AMDgpu Assignee: dri-devel@lists.freedesktop.org Reporter: haagch@frickel.club A stutter once wouldn't be so bad, but apps like radeon-profile repeatedly = read this file, so rendering stutters constantly. You will have a hard time spotting it in the average fps graph, but with my (still very inaccurate) low-fps patch at https://github.com/ChristophHaag/mesa-mesa/commit/e097b91a85c85718576589402= e075e7f5668e68c it's very visible that there is at least one frame that's delayed a lot each time amdgpu_pm_info is read. The GPU load does give an independent hint that something is wrong though. To reproduce: run glxgears run sudo watch --interval=3D.3 cat /sys/kernel/debug/dri/0/amdgpu_pm_info observe stuttering in glxgears. RX 480, Linux 4.12-rc2. I haven't tested 4.11 to confirm, but if I remember correctly, this happens= in mainline since 4.12. --=20 You are receiving this mail because: You are the assignee for the bug.= --14956955520.26622d.19995 Date: Thu, 25 May 2017 06:59:12 +0000 MIME-Version: 1.0 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: http://bugs.freedesktop.org/ Auto-Submitted: auto-generated
Bug ID 101182
Summary Reading amdgpu_pm_info causes stutter with Linux 4.12-rc
Product DRI
Version DRI git
Hardware Other
OS All
Status NEW
Severity normal
Priority medium
Component DRM/AMDgpu
Assignee dri-devel@lists.freedesktop.org
Reporter haagch@frickel.club 

A stutter once wouldn't be so bad, but apps like radeon-profil=
e repeatedly read
this file, so rendering stutters constantly.

You will have a hard time spotting it in the average fps graph, but with my
(still very inaccurate) low-fps patch at
https://github.com/ChristophHaag/mesa-mesa/comm=
it/e097b91a85c85718576589402e075e7f5668e68c
it's very visible that there is at least one frame that's delayed a lot each
time amdgpu_pm_info is read.
The GPU load does give an independent hint that something is wrong though.

To reproduce:
run  glxgears
run  sudo watch --interval=3D.3 cat /sys/kernel/debug/dri/0/amdgpu_pm_info
observe stuttering in glxgears.

RX 480, Linux 4.12-rc2.
I haven't tested 4.11 to confirm, but if I remember correctly, this happens=
 in
mainline since 4.12.

You are receiving this mail because:
  • You are the assignee for the bug.
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