Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S964793Ab0KQW4z (ORCPT ); Wed, 17 Nov 2010 17:56:55 -0500 Received: from smtp.polymtl.ca ([132.207.4.11]:41172 "EHLO smtp.polymtl.ca" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S935576Ab0KQW4y (ORCPT ); Wed, 17 Nov 2010 17:56:54 -0500 Message-ID: <1290034589.4ce45d9d7be28@www.imp.polymtl.ca> Date: Wed, 17 Nov 2010 17:56:29 -0500 From: Douglas Santos To: Steven Rostedt Cc: "linux-kernel@vger.kernel.org" , "ltt-dev@lists.casi.polymtl.ca" , David Sharp , Mathieu Desnoyers , Ingo Molnar , Andrew Morton , Michael Rubin Subject: Re: Benchmarks of kernel tracing options 2 (ftrace, lttng and perf) References: <1290029498.4ce449ba1679d@www.imp.polymtl.ca> <1290030106.30543.74.camel@gandalf.stny.rr.com> In-Reply-To: <1290030106.30543.74.camel@gandalf.stny.rr.com> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7BIT User-Agent: Internet Messaging Program (IMP) 3.2.3 X-Originating-IP: 70.55.65.249 X-Poly-FromMTA: (imp-4-3.polymtl.ca [132.207.4.78]) at Wed, 17 Nov 2010 22:56:30 +0000 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1135 Lines: 36 Quoting Steven Rostedt : > On Wed, 2010-11-17 at 16:31 -0500, Douglas Santos wrote: > > Hi all, > > > > This is a response to a benchmark, submitted a few weeks ago, comparing > kernel > > tracing options. > > http://lkml.org/lkml/2010/10/28/422 > > > > We followed the methodology described in the link bellow, > > but using the shellscripts posted there to reproduce autotest scripts. > > http://lkml.org/lkml/2010/10/28/261 > > > > We disabled the extra syscall tracing on lttng, for a fair comparison. > > http://lkml.org/lkml/2010/10/28/290 > > > > Average results with tracing "on": > > > > lttng: 220 ns > > ftrace: 260 ns > > Heh, so ftrace got worse with the new kernel? The previous bench was doing tracing "on" minus "off" average results. They also used autotest scripts, not sure if it does exactly the same thing. I'll check if we missed something. -- 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/