Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753639AbXICPoU (ORCPT ); Mon, 3 Sep 2007 11:44:20 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751523AbXICPoJ (ORCPT ); Mon, 3 Sep 2007 11:44:09 -0400 Received: from lucidpixels.com ([75.144.35.66]:58804 "EHLO lucidpixels.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750895AbXICPoI (ORCPT ); Mon, 3 Sep 2007 11:44:08 -0400 Date: Mon, 3 Sep 2007 11:44:08 -0400 (EDT) From: Justin Piszcz X-X-Sender: jpiszcz@p34.internal.lan To: Bill Davidsen cc: bjdouma@xs4all.nl, linux-kernel@vger.kernel.org Subject: Re: bogomips discrepancy on Intel Core2 Quad CPU In-Reply-To: <46DC1E9B.3030108@tmr.com> Message-ID: References: <46DBC092.8030209@xs4all.nl> <46DC1E9B.3030108@tmr.com> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1720 Lines: 62 On Mon, 3 Sep 2007, Bill Davidsen wrote: > Bauke Jan Douma wrote: >> $> uname -a >> Linux skyscraper 2.6.22.5 #7 SMP PREEMPT Sun Sep 2 12:12:25 CEST 2007 i686 >> GNU/Linux >> >> $> cat /proc/cpuinfo | grep bogomips >> bogomips : 4813.46 >> bogomips : 4810.91 >> bogomips : 4810.91 >> bogomips : 10583.94 >> >> The latter seems way off base. >> Prod me for more info. >> > I see this occasionally on a dual, speedstep (or similar) finds a way to > throttle down the cores under light load. I suspect that if you load the > system: > > for n in 1 2 3 4; do > nice -19 bash -c 'while true; do a=$RANDOM; done' & > done > > Then you should see your bogomips rise on all cores. > > >> bjd > > [... copy of output snipped, see the O.P. ...] > > -- > Bill Davidsen > "We have more to fear from the bungling of the incompetent than from > the machinations of the wicked." - from Slashdot > - > 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/ > $ uname -a Linux p34.internal.lan 2.6.22 #2 SMP Mon Jul 16 18:40:31 EDT 2007 x86_64 GNU/Linux $ cat /proc/cpuinfo | grep bogomips bogomips : 4797.72 bogomips : 4795.16 bogomips : 4795.21 bogomips : 4795.19 Mine is fine, not using any speedstep here. Justin. - 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/