From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S264910AbUD2SGK (ORCPT ); Thu, 29 Apr 2004 14:06:10 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S264912AbUD2SGK (ORCPT ); Thu, 29 Apr 2004 14:06:10 -0400 Received: from x35.xmailserver.org ([69.30.125.51]:1487 "EHLO x35.xmailserver.org") by vger.kernel.org with ESMTP id S264910AbUD2SF5 (ORCPT ); Thu, 29 Apr 2004 14:05:57 -0400 X-AuthUser: davidel@xmailserver.org Date: Thu, 29 Apr 2004 11:05:54 -0700 (PDT) From: Davide Libenzi X-X-Sender: davide@bigblue.dev.mdolabs.com To: Nick Piggin cc: linux-kernel Subject: Re: scheduler latency In-Reply-To: <4090CA85.6050009@yahoo.com.au> Message-ID: References: <4090CA85.6050009@yahoo.com.au> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 29 Apr 2004, Nick Piggin wrote: > I've done some scheduler latency tests and come up with some > pretty plots, so I thought I'd post them. It is nicksched vs > mainline. > > Note: this is not realtime scheduling latency, but latency as > measured by my random program. It also does not indicate > interactivity, because the latencies measured were all under > 15ms which is probably below perception. Even if not, it > doesn't measure latency as you might see it. > > Finally, some of the tests involved me moving the mouse around, > so factor in by subliminal (or not) bias toward my scheduler. > > http://www.kerneltrap.org/~npiggin/schedlat3/index.html Nick, when I did the SOFTRR hack, I also measured sched latencies using another measurement/load apps: http://www.xmailserver.org/linux-patches/softrr.html At the bottom you can find the measurement app (note: x86 only since it uses "rdtsc") and stressful (latency-wise) loads. - Davide