From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261180AbTFCRLL (ORCPT ); Tue, 3 Jun 2003 13:11:11 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261188AbTFCRLL (ORCPT ); Tue, 3 Jun 2003 13:11:11 -0400 Received: from holomorphy.com ([66.224.33.161]:17320 "EHLO holomorphy") by vger.kernel.org with ESMTP id S261180AbTFCRLJ (ORCPT ); Tue, 3 Jun 2003 13:11:09 -0400 Date: Tue, 3 Jun 2003 10:24:31 -0700 From: William Lee Irwin III To: Robert Love Cc: Con Kolivas , linux kernel mailing list , Zwane Mwaikambo Subject: Re: [BENCHMARK] 100Hz preempt v nopreempt contest results Message-ID: <20030603172431.GW8978@holomorphy.com> Mail-Followup-To: William Lee Irwin III , Robert Love , Con Kolivas , linux kernel mailing list , Zwane Mwaikambo References: <200306031639.49515.kernel@kolivas.org> <1054659956.633.85.camel@localhost> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1054659956.633.85.camel@localhost> Organization: The Domain of Holomorphy User-Agent: Mutt/1.5.4i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 2003-06-02 at 23:39, Con Kolivas wrote: >> Note this time the ratio is less useful since they are both 100Hz. The >> difference this time shows a large preempt improvement in process_load much >> like 1000Hz did. Interestingly, even unloaded kernels no_load and cache_load >> runs are faster with preempt. Only in xtar_load (repeatedly extracting a tar >> with multiple small files) was no preempt faster. On Tue, Jun 03, 2003 at 10:05:58AM -0700, Robert Love wrote: > Thanks for running these, Con. > I think this is an example of kernel preemption doing exactly what we > want it to (improve interactive performance)... probably primarily > because of the more accurate timeslice distribution. > Would be interested to figure out why xtar_load is slower. It would be helpful to get more accurate time accounting a la Mike Galbraith's patches. -- wli