From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261613AbUB1LXT (ORCPT ); Sat, 28 Feb 2004 06:23:19 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261626AbUB1LXT (ORCPT ); Sat, 28 Feb 2004 06:23:19 -0500 Received: from mail-06.iinet.net.au ([203.59.3.38]:58269 "HELO mail.iinet.net.au") by vger.kernel.org with SMTP id S261613AbUB1LXF (ORCPT ); Sat, 28 Feb 2004 06:23:05 -0500 Message-ID: <40407A14.90108@cyberone.com.au> Date: Sat, 28 Feb 2004 22:23:00 +1100 From: Nick Piggin User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.6) Gecko/20040122 Debian/1.6-1 X-Accept-Language: en MIME-Version: 1.0 To: Con Kolivas CC: linux kernel mailing list Subject: Re: sched domains kernbench improvements References: <200402282159.58452.kernel@kolivas.org> <40407847.7040403@cyberone.com.au> <200402282218.41590.kernel@kolivas.org> In-Reply-To: <200402282218.41590.kernel@kolivas.org> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Con Kolivas wrote: >On Sat, 28 Feb 2004 22:15, Nick Piggin wrote: > >>Con Kolivas wrote: >> >>>Hi Nick >>> >>> >>>>So it is more a matter of tuning than anything fundamental >>>> >>>Geez I know how you feel... :-D >>> >>> >>>I tried it on the X440 with sched smt disabled >>> >>>better than before but still slower than vanilla on half load; however >>>better than vanilla on optimal and full load now! I wonder whether the >>>worse result on half load is as relevant since this is 8x HT cpus? >>> >>Thanks. Yep the drop off at half load is to be expected with >>CONFIG_SCHED_SMT turned off. >> > >Will this affect the SCHED_SMT performance and should I do a round of benchies >with this enabled? > > It will as far as balancing between physical CPUs, yes. It probably doesn't make quite a big difference because it is less of a problem if one sibling goes idle than if one CPU (in the 8-way) goes idle). But if you could do a round with SCHED_SMT enabled it would be very nice of you ;)