Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1422885AbWBILV2 (ORCPT ); Thu, 9 Feb 2006 06:21:28 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1422889AbWBILV2 (ORCPT ); Thu, 9 Feb 2006 06:21:28 -0500 Received: from ecfrec.frec.bull.fr ([129.183.4.8]:39558 "EHLO ecfrec.frec.bull.fr") by vger.kernel.org with ESMTP id S1422885AbWBILV1 convert rfc822-to-8bit (ORCPT ); Thu, 9 Feb 2006 06:21:27 -0500 Subject: Re: preempt-rt, NUMA and strange latency traces From: =?ISO-8859-1?Q?S=E9bastien_Dugu=E9?= To: Lee Revell Cc: Steven Rostedt , "linux-kernel@vger.kernel.org" , Ingo Molnar In-Reply-To: <1139465045.30058.31.camel@mindpipe> References: <1139311689.19708.36.camel@frecb000686> <1139395534.21471.13.camel@frecb000686> <1139465045.30058.31.camel@mindpipe> Date: Thu, 09 Feb 2006 12:24:35 +0100 Message-Id: <1139484275.5706.19.camel@frecb000686> Mime-Version: 1.0 X-Mailer: Evolution 2.2.3 X-MIMETrack: Itemize by SMTP Server on ECN002/FR/BULL(Release 5.0.12 |February 13, 2003) at 09/02/2006 12:22:28, Serialize by Router on ECN002/FR/BULL(Release 5.0.12 |February 13, 2003) at 09/02/2006 12:22:30, Serialize complete at 09/02/2006 12:22:30 Content-Transfer-Encoding: 8BIT Content-Type: text/plain; charset=ISO-8859-15 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 924 Lines: 23 On Thu, 2006-02-09 at 01:04 -0500, Lee Revell wrote: > On Wed, 2006-02-08 at 11:45 +0100, S?bastien Dugu? wrote: > > The more I think about it, the more I tend to believe it's hardware > > related. It seems as if the CPU just hangs for ~27 ms before > > resuming processing. > > That would be an exceptionally long latency - you would probably notice > it if the mouse froze, VOIP dropped out, ping stops, etc for 30ms. > It's a test machine and I use it remotely with console redirected so no mouse, no RT applications aside from my silly nanosleep() loop. But I do notice that that test sometimes takes more time (ie when I get those weird latencies). S?bastien. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/