From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stanislav Meduna Subject: Re: timerfd read does not return - was probably fixed in 3.4.38 Date: Mon, 29 Apr 2013 10:43:27 +0200 Message-ID: <517E32AF.8080907@meduna.org> References: <516BDE52.90200@meduna.org> <516BF8FD.2000700@meduna.org> <516EC3F3.1080406@meduna.org> <516FB8B9.9090506@meduna.org> <517B8D91.4010700@meduna.org> <517D0DD0.6040307@osadl.org> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: "linux-rt-users@vger.kernel.org" To: Carsten Emde Return-path: Received: from www.meduna.org ([92.240.244.38]:35800 "EHLO meduna.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751311Ab3D2Inh (ORCPT ); Mon, 29 Apr 2013 04:43:37 -0400 In-Reply-To: <517D0DD0.6040307@osadl.org> Sender: linux-rt-users-owner@vger.kernel.org List-ID: On 28.04.2013 13:53, Carsten Emde wrote: Hi Carsten, > We, therefore, configure and enable continuous latency > monitoring histograms (CONFIG_WAKEUP_LATENCY_HIST and > CONFIG_MISSED_TIMER_OFFSETS_HIST) by default in all our farm systems > since more than two years (https://www.osadl.org/?id=864), and we are > not aware of any problem that might be related to them. The problem is our systems that started to exhibit this problem did have just these enabled :( Many more were compiled in. Your continuous test farm is impressive! A suggestion: would it be possible to also add a dmesg and more of the /proc/timer_list output to the profile pages? This would make comparing with the own system even easier. For example the Geode system at https://www.osadl.org/?id=948 : how did you convince it to use highres timers? In my environment the Geode LX / CS5536 needs tsc=reliable, but your kernel command line does not contain it. Thanks -- Stano