From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sebastian Andrzej Siewior Subject: Re: AW: Large latencies with 4.4.1-rt6 Date: Thu, 25 Feb 2016 17:29:01 +0100 Message-ID: <56CF2BCD.3050109@linutronix.de> References: <1A2AF5F768264E479963C4D8C015EB691B692C5C@dlrexmbx03.intra.dlr.de> <20160225152930.GC16161@linutronix.de> <1A2AF5F768264E479963C4D8C015EB691B6974A2@dlrexmbx03.intra.dlr.de> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Cc: linux-rt-users@vger.kernel.org To: Martin.Wirth@dlr.de Return-path: Received: from www.linutronix.de ([62.245.132.108]:54301 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753461AbcBYQ3D (ORCPT ); Thu, 25 Feb 2016 11:29:03 -0500 In-Reply-To: <1A2AF5F768264E479963C4D8C015EB691B6974A2@dlrexmbx03.intra.dlr.de> Sender: linux-rt-users-owner@vger.kernel.org List-ID: On 02/25/2016 05:08 PM, Martin.Wirth@dlr.de wrote: > Hi Sebastian Hi Martin, > I will have access to the machine for longer testing next Monday again. But I remember that v4.4.1-rt5 showed the same long latencies. > Will try v4.4-rt3 and v4.4-rt2 beginning of next week. If this would be your first try I would suggest to run hwlatdetect in case BIOS is calling for attention. However since you don't see this in v4.1 is looks unlikely. It also might be help to have a log to see what the other CPUs are doing around that time. Are they busy doing something or do they pause as well. Also do try some fancy PM things (but then again why now and not in v4.1 as well). > Martin Sebastian