Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756002Ab3J2NLz (ORCPT ); Tue, 29 Oct 2013 09:11:55 -0400 Received: from mail-ee0-f42.google.com ([74.125.83.42]:40076 "EHLO mail-ee0-f42.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755927Ab3J2NLx (ORCPT ); Tue, 29 Oct 2013 09:11:53 -0400 Date: Tue, 29 Oct 2013 14:11:49 +0100 From: Ingo Molnar To: Neil Horman Cc: Eric Dumazet , linux-kernel@vger.kernel.org, sebastien.dugue@bull.net, Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , x86@kernel.org, netdev@vger.kernel.org Subject: Re: [PATCH] x86: Run checksumming in parallel accross multiple alu's Message-ID: <20131029131149.GB20408@gmail.com> References: <20131028160131.GA31048@hmsreliant.think-freely.org> <20131028162438.GB14350@gmail.com> <20131028174630.GB31048@hmsreliant.think-freely.org> <20131028182913.GD31048@hmsreliant.think-freely.org> <20131029082542.GA24625@gmail.com> <20131029112022.GA24477@neilslaptop.think-freely.org> <20131029113031.GA16897@gmail.com> <20131029114907.GE24477@neilslaptop.think-freely.org> <20131029125233.GA17449@gmail.com> <20131029130712.GA25078@neilslaptop.think-freely.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20131029130712.GA25078@neilslaptop.think-freely.org> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 998 Lines: 27 * Neil Horman wrote: > I'm sure it worked properly on my system here, I specificially > checked it, but I'll gladly run it again. You have to give me an > hour as I have a meeting to run to, but I'll have results shortly. So what I tried to react to was this observation of yours: > > > Heres my data for running the same test with taskset > > > restricting execution to only cpu0. I'm not quite sure whats > > > going on here, but doing so resulted in a 10x slowdown of the > > > runtime of each iteration which I can't explain. [...] A 10x slowdown would be consistent with not running your testcase but 'perf bench sched messaging' by accident, or so. But I was really just guessing wildly here. Thanks, Ingo -- 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/