From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261797AbVFWAN6 (ORCPT ); Wed, 22 Jun 2005 20:13:58 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261156AbVFWALK (ORCPT ); Wed, 22 Jun 2005 20:11:10 -0400 Received: from mx2.elte.hu ([157.181.151.9]:59282 "EHLO mx2.elte.hu") by vger.kernel.org with ESMTP id S261846AbVFWAKg (ORCPT ); Wed, 22 Jun 2005 20:10:36 -0400 Date: Thu, 23 Jun 2005 02:10:23 +0200 From: Ingo Molnar To: William Weston Cc: "K.R. Foley" , linux-kernel@vger.kernel.org, "Eugeny S. Mints" , Daniel Walker Subject: Re: [patch] Real-Time Preemption, -RT-2.6.12-rc6-V0.7.48-00 Message-ID: <20050623001023.GC11486@elte.hu> References: <20050616072935.GB19772@elte.hu> <42B160F5.9060208@cybsft.com> <20050616173247.GA32552@elte.hu> <20050621131249.GB22691@elte.hu> <20050622082450.GA19957@elte.hu> <20050622220007.GA28258@elte.hu> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.4.2.1i X-ELTE-SpamVersion: MailScanner 4.31.6-itk1 (ELTE 1.2) SpamAssassin 2.63 ClamAV 0.73 X-ELTE-VirusStatus: clean X-ELTE-SpamCheck: no X-ELTE-SpamCheck-Details: score=-4.9, required 5.9, autolearn=not spam, BAYES_00 -4.90 X-ELTE-SpamLevel: X-ELTE-SpamScore: -4 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org * William Weston wrote: > > these are all the first type of latencies, which seem to be hardware > > related. Could you try to boot the UP kernel, do you see these latencies > > there too? (if yes then please post those too) > > On -50-11 UP, the ~200us idle is still showing up in the traces. This > idle time, however, seems to be at random points within the trace. > Some of the traces attached are nearly identical except for where the > ~200us jump happens to fall. Hardware induced latency? yes, very likely hardware (or system BIOS, e.g. SMM) induced. Ingo