From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752730Ab1HPOpZ (ORCPT ); Tue, 16 Aug 2011 10:45:25 -0400 Received: from e4.ny.us.ibm.com ([32.97.182.144]:48571 "EHLO e4.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751472Ab1HPOpX (ORCPT ); Tue, 16 Aug 2011 10:45:23 -0400 Message-ID: <4E4A7BE3.5090902@us.ibm.com> Date: Tue, 16 Aug 2011 07:17:07 -0700 From: Nivedita Singhvi User-Agent: Thunderbird 2.0.0.24 (X11/20100411) MIME-Version: 1.0 To: Mike Galbraith CC: paulmck@linux.vnet.ibm.com, Peter Zijlstra , linux-kernel , Thomas Gleixner , linux-rt-users Subject: Re: [ANNOUNCE] 3.0.1-rt11 References: <1313232790.25267.7.camel@twins> <1313236135.4486.10.camel@marge.simson.net> <1313236713.25267.10.camel@twins> <1313243965.4486.36.camel@marge.simson.net> <20110813162735.GA2650@linux.vnet.ibm.com> <1313295821.6334.5.camel@marge.simson.net> In-Reply-To: <1313295821.6334.5.camel@marge.simson.net> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Mike Galbraith wrote: > On Sat, 2011-08-13 at 09:27 -0700, Paul E. McKenney wrote: > >> Strange. By the time it got around to printing the stall, no one was >> stalling: >> >> [ 100.409012] INFO: rcu_preempt_state detected stalls on CPUs/tasks: {} (detected by 21, t=60002 jiffies) >> >> Now it -is- possible for the stall to end just as we get ready to detect >> it, but that window is really really small. The most recent occurrence >> of this sort of thing was due misconfigured timekeeping, but I don't see >> any sign of that in the trace. >> >> This happens repeatedly? > > Yeah. When I put -rt9 on the UV box, it was doing the just idling, and > boom thing I saw with earlier releases on both my Q6600 and x3550 M3 > boxes. -rt10 seems to have just changed the timing. > > I'll update the x3550 M3, and see if it still gripes. UV isn't virgin > source, has to be twiddled a little. (symptom was identical though) Mike, Which test were you running? Because I'm not seeing it on our x3550 M3.. thanks, Nivedita