Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261788AbUJYM6t (ORCPT ); Mon, 25 Oct 2004 08:58:49 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261794AbUJYM6t (ORCPT ); Mon, 25 Oct 2004 08:58:49 -0400 Received: from mx2.elte.hu ([157.181.151.9]:21392 "EHLO mx2.elte.hu") by vger.kernel.org with ESMTP id S261788AbUJYM4v (ORCPT ); Mon, 25 Oct 2004 08:56:51 -0400 Date: Mon, 25 Oct 2004 14:58:07 +0200 From: Ingo Molnar To: linux-kernel Mailing List Cc: Sami Farin <7atbggg02@sneakemail.com> Subject: Re: Linux 2.6.9 latencies: scheduler bug? Message-ID: <20041025125807.GA8432@elte.hu> References: <20041024212618.GA19377@m.safari.iki.fi> <20041025120021.GA9917@m.safari.iki.fi> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20041025120021.GA9917@m.safari.iki.fi> User-Agent: Mutt/1.4.1i X-ELTE-SpamVersion: MailScanner 4.31.6-itk1 (ELTE 1.2) SpamAssassin 2.63 ClamAV 0.73 X-ELTE-VirusStatus: clean X-ELTE-SpamCheck: no X-ELTE-SpamCheck-Details: score=-4.9, required 5.9, autolearn=not spam, BAYES_00 -4.90 X-ELTE-SpamLevel: X-ELTE-SpamScore: -4 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 989 Lines: 23 * Sami Farin <7atbggg02@sneakemail.com> wrote: > forget this stupid ip_tables.c patch, latencies have nothing to do with > netfilter code, but bad interaction between xmms, rtc_latencytest > and iptables. I now get at max 3.1s (yup, 3100000us) latencies. > http://safari.iki.fi/2.6.9-xmms-fun-1.png > if you want to reproduce this: > 1) run "rtc_latencytest 1024" (can't reproduce with "rtc_latencytest 512") > 2) press play in xmms > 3) start iptables-script to further debug any latencies please apply the -RT patchset and enable PREEMPT_TIMING (and LATENCY_TRACING), that enables us to tell us more about the latencies. You dont have to enable PREEMPT_REALTIME (the most experimental feature of the patchset) to measure latencies. Ingo - 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/