From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jan Niggemann Subject: i915 irq storm mitigation in 3.10 Date: Sat, 06 Jul 2013 23:41:07 +0200 Message-ID: <2b828191fde71b2243f883e2dbb28d6d@hz6.de> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; Format="flowed" Content-Transfer-Encoding: 7bit Return-path: Received: from d119a3.x-mailer.de (d119a3.x-mailer.de [212.162.53.143]) by gabe.freedesktop.org (Postfix) with ESMTP id 13CF3E5D57 for ; Sat, 6 Jul 2013 15:15:58 -0700 (PDT) Received: from [127.0.0.1] (helo=hz6.de) by d119.x-mailer.de with esmtp (Exim 4.63) (envelope-from ) id 1UvaE7-0001j7-Ig for intel-gfx@lists.freedesktop.org; Sat, 06 Jul 2013 23:41:07 +0200 List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: intel-gfx-bounces+gcfxdi-intel-gfx=m.gmane.org@lists.freedesktop.org Errors-To: intel-gfx-bounces+gcfxdi-intel-gfx=m.gmane.org@lists.freedesktop.org To: intel-gfx@lists.freedesktop.org List-Id: intel-gfx@lists.freedesktop.org Hi list, I'm not sure, but I think the recent patch to keep i915 systems from locking up / slowing down in case of irq storms didn't fully help. I compiled 3.10, but every now and then, my system has the same symptoms as before. grep storm /var/log/messages Jul 5 21:55:43 muretop kernel: [ 324.767375] [drm] HPD interrupt storm detected on connector DP-3: switching from hotplug detection to polling Jul 6 23:05:57 muretop kernel: [ 200.372208] [drm] HPD interrupt storm detected on connector HDMI-A-1: switching from hotplug detection to polling Jul 6 23:07:51 muretop kernel: [ 313.752039] [drm] HPD interrupt storm detected on connector DP-3: switching from hotplug detection to pol I notice up to 50% CPU from kworker/u8:0 when my system slows down. I'm new to kernel development, but if you tell me what to do, I'm very willing to help diagnosing this. Regards jan