From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754798AbYDBLbM (ORCPT ); Wed, 2 Apr 2008 07:31:12 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753046AbYDBLa6 (ORCPT ); Wed, 2 Apr 2008 07:30:58 -0400 Received: from gprs189-60.eurotel.cz ([160.218.189.60]:45515 "EHLO gprs189-60.eurotel.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753040AbYDBLa6 (ORCPT ); Wed, 2 Apr 2008 07:30:58 -0400 Date: Wed, 2 Apr 2008 13:31:32 +0200 From: Pavel Machek To: Michael Meyer Cc: linux-kernel@vger.kernel.org Subject: Re: performance differences: "maxcpus=1" vs. "echo 0 > /sys/devices/system/cpu/cpu1/online" Message-ID: <20080402113132.GA3181@elf.ucw.cz> References: <20080329212203.GB2153@elf.ucw.cz> <548290.15521.qm@web25803.mail.ukl.yahoo.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <548290.15521.qm@web25803.mail.ukl.yahoo.com> X-Warning: Reading this can be dangerous to your mental health. User-Agent: Mutt/1.5.17 (2007-11-01) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi! > > Ok, and your chip is too old to have "Enhanced Dynamic Acceleration > > Technology" (Intel, can't you use some reasonable names?!)... both > > would explain effects you see, and it is neither... > > It is too old to have that. I bought it at the beginning of 2007 and it > is from the first line of Core 2 Duo processors (released in summer > 2006). I think "Enhanced Dynamic Acceleration Technology" is only > available recently. > > > You could try implementing deep sleep (C4) state for cpu hotplug.... > > I have to confess that I sneaked unto LKML illegitimately, as I am not > a kernel hacker. You can still play one, and submit a patch. Over internet, noone can tell if you are hacker or not ;-). I would be happy to help with good advice ;-). Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html