Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753535Ab3J2IZt (ORCPT ); Tue, 29 Oct 2013 04:25:49 -0400 Received: from mail-ee0-f47.google.com ([74.125.83.47]:53921 "EHLO mail-ee0-f47.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751510Ab3J2IZq (ORCPT ); Tue, 29 Oct 2013 04:25:46 -0400 Date: Tue, 29 Oct 2013 09:25:42 +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: <20131029082542.GA24625@gmail.com> References: <20131012172124.GA18241@gmail.com> <20131014202854.GH26880@hmsreliant.think-freely.org> <1381785560.2045.11.camel@edumazet-glaptop.roam.corp.google.com> <1381789127.2045.22.camel@edumazet-glaptop.roam.corp.google.com> <20131017003421.GA31470@hmsreliant.think-freely.org> <20131017084121.GC22705@gmail.com> <20131028160131.GA31048@hmsreliant.think-freely.org> <20131028162438.GB14350@gmail.com> <20131028174630.GB31048@hmsreliant.think-freely.org> <20131028182913.GD31048@hmsreliant.think-freely.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20131028182913.GD31048@hmsreliant.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: 865 Lines: 23 * Neil Horman wrote: > 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. As before however, both the > parallel alu run and the prefetch run resulted in speedups, but > the two together were not in any way addative. I'm going to keep > playing with the prefetch stride, unless you have an alternate > theory. Could you please cite the exact command-line you used for running the test? 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/