From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760222AbZEHMIS (ORCPT ); Fri, 8 May 2009 08:08:18 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755021AbZEHMID (ORCPT ); Fri, 8 May 2009 08:08:03 -0400 Received: from mx3.mail.elte.hu ([157.181.1.138]:50029 "EHLO mx3.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751695AbZEHMIB (ORCPT ); Fri, 8 May 2009 08:08:01 -0400 Date: Fri, 8 May 2009 14:07:40 +0200 From: Ingo Molnar To: Len Brown Cc: Steven Rostedt , LKML , Thomas Gleixner , john stultz Subject: Re: regression in TSC unstable? Message-ID: <20090508120740.GB18758@elte.hu> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.18 (2008-05-17) X-ELTE-VirusStatus: clean X-ELTE-SpamScore: -1.5 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-1.5 required=5.9 tests=BAYES_00 autolearn=no SpamAssassin version=3.2.3 -1.5 BAYES_00 BODY: Bayesian spam probability is 0 to 1% [score: 0.0000] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Len Brown wrote: > On Fri, 8 May 2009, Steven Rostedt wrote: > > > The ring-buffer-benchmark module creates a producer and consumer and loops > > on do_gettimeofday until it hits about 10 seconds. Then it calculates the > > number of events recorded / time running. > > > > After Ingo merged Linus's latest > > merged what into what? > are you referring to the upstream kernel or something else? he's describing how he found it: a not-yet-upstream kernel-benchmark module showed a performance regression that came in via upstream. The regression is upstream too, just harder to notice. Ingo