From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261539AbVFEJkt (ORCPT ); Sun, 5 Jun 2005 05:40:49 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261542AbVFEJkt (ORCPT ); Sun, 5 Jun 2005 05:40:49 -0400 Received: from mx2.elte.hu ([157.181.151.9]:18321 "EHLO mx2.elte.hu") by vger.kernel.org with ESMTP id S261539AbVFEJkn (ORCPT ); Sun, 5 Jun 2005 05:40:43 -0400 Date: Sun, 5 Jun 2005 11:36:32 +0200 From: Ingo Molnar To: Daniel Walker Cc: linux-kernel@vger.kernel.org, Thomas Gleixner Subject: Re: RT and pi_test Message-ID: <20050605093632.GA6283@elte.hu> References: 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, 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 * Daniel Walker wrote: > I've run the pi_test a few times recently with some strange > numbers. I'm getting abnormally high task latency if I run "./test > --tasks=10 ./hist" . Depending on how long I run it, I've seen task > latency as high as 3 milliseconds, should be 0.1ms or less. > > The first time I saw these latencies I has the PI abstraction applied, > and the most recent time I had the attached patch applied only. This > patch is small so I'm not sure if it could have that type of effect on > task latency. this patch now clashes with Thomas' changes. Did you mean me to apply this patch, or is it now moot? (The way i read your mail originally what that it was describing a problem with latencies, and including a patch as the only thing that you had applied. It didnt too inviting to apply :-| ) Ingo