From mboxrd@z Thu Jan 1 00:00:00 1970 From: bugzilla-daemon@freedesktop.org Subject: [Bug 97260] R9 290 low performance in Linux 4.7 Date: Tue, 09 Aug 2016 13:45:48 +0000 Message-ID: Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============0964896088==" Return-path: Received: from culpepper.freedesktop.org (culpepper.freedesktop.org [131.252.210.165]) by gabe.freedesktop.org (Postfix) with ESMTP id D792789CE0 for ; Tue, 9 Aug 2016 13:45:48 +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 --===============0964896088== Content-Type: multipart/alternative; boundary="14707503480.ae9792.18691"; charset="UTF-8" --14707503480.ae9792.18691 Date: Tue, 9 Aug 2016 13:45:48 +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=3D97260 Bug ID: 97260 Summary: R9 290 low performance in Linux 4.7 Product: DRI Version: unspecified Hardware: x86-64 (AMD64) OS: Linux (All) Status: NEW Keywords: regression Severity: major Priority: high Component: DRM/Radeon Assignee: dri-devel@lists.freedesktop.org Reporter: magolobel@yahoo.com.br Starting with Linux Kernel 4.7, the Radeon R9 290 started showing very low performance, about 20/30% of what is available up to kernel 4.6. As can be = seen in this article, the performance regression started even before the launch = of kernel 4.7 RC1, using Alex Deucher's drm-next-4.7 branch: http://www.phoronix.com/scan.php?page=3Darticle&item=3Dradeon-drm-next-47&n= um=3D1 Some time later it was speculated that the problem may be with DPM: http://www.phoronix.com/scan.php?page=3Dnews_item&px=3DLinux-4.7-R9-290-Reg= ression To replicate the bug, install Ubuntu 16.04 64bits and install kernel 4.7 fr= om here (preferably above rc5): http://kernel.ubuntu.com/~kernel-ppa/mainline/=20 The performance regression will show right away. Rebooting the system and choosing a kernel version up to 4.6 will fix the bug. --=20 You are receiving this mail because: You are the assignee for the bug.= --14707503480.ae9792.18691 Date: Tue, 9 Aug 2016 13:45:48 +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 97260
Summary R9 290 low performance in Linux 4.7
Product DRI
Version unspecified
Hardware x86-64 (AMD64)
OS Linux (All)
Status NEW
Keywords regression
Severity major
Priority high
Component DRM/Radeon
Assignee dri-devel@lists.freedesktop.org
Reporter magolobel@yahoo.com.br 

Starting with Linux Kernel 4.7, the Radeon R9 290 started show=
ing very low
performance, about 20/30% of what is available up to kernel 4.6. As can be =
seen
in this article, the performance regression started even before the launch =
of
kernel 4.7 RC1, using Alex Deucher's drm-next-4.7 branch:

http://www.phoronix.com/scan.php?page=3Darticle&=
amp;item=3Dradeon-drm-next-47&num=3D1

Some time later it was speculated that the problem may be with DPM:

http://www.phoronix.com/scan.php?page=3Dnews_item&a=
mp;px=3DLinux-4.7-R9-290-Regression

To replicate the bug, install Ubuntu 16.04 64bits and install kernel 4.7 fr=
om
here (preferably above rc5):

http://kernel.ub=
untu.com/~kernel-ppa/mainline/=20

The performance regression will show right away. Rebooting the system and
choosing a kernel version up to 4.6 will fix the bug.

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