Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754124AbZGFRY6 (ORCPT ); Mon, 6 Jul 2009 13:24:58 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753204AbZGFRYs (ORCPT ); Mon, 6 Jul 2009 13:24:48 -0400 Received: from mail.anarazel.de ([217.115.131.40]:56000 "EHLO smtp.anarazel.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752843AbZGFRYs (ORCPT ); Mon, 6 Jul 2009 13:24:48 -0400 From: Andres Freund To: Jarek Poplawski Subject: Re: Soft-Lockup/Race in networking in 2.6.31-rc1+195 ( possibly?caused by netem) Date: Mon, 6 Jul 2009 19:24:47 +0200 User-Agent: KMail/1.12.0 (Linux/2.6.31-rc1-andres-00457-g396ca83-dirty; KDE/4.2.95; x86_64; ; ) Cc: Joao Correia , Arun R Bharadwaj , Thomas Gleixner , Stephen Hemminger , netdev@vger.kernel.org, LKML References: <200907031326.21822.andres@anarazel.de> <200907061813.29379.andres@anarazel.de> <20090706163106.GA4559@ami.dom.local> In-Reply-To: <20090706163106.GA4559@ami.dom.local> MIME-Version: 1.0 Content-Type: Text/Plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Message-Id: <200907061924.48448.andres@anarazel.de> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1154 Lines: 25 On Monday 06 July 2009 18:31:06 Jarek Poplawski wrote: > On Mon, Jul 06, 2009 at 06:13:29PM +0200, Andres Freund wrote: > > > > Btw, I ran netem with delay for more than 48h on around 80mbit... > > > > That does not exclude such a rarely triggered race, but makes it a > > > > bit more unlikely. (With migration thats around 3sec or so) > > Sorry once more. > Andres, the bisection + the above - you did 'the whole lotta work' and > you shouldn't be sorry at all! ;-) To be fair I have to admit I did run netem for 48hours for other reasons ;-) I also ran my modified netem, but all it currently does is adjusing delay/jitter by other means, so that should have no influence. I am trying to produce artificial loss patterns similar to really occuring network loss. I just switched mail client btw ;-) ATM I have no further ideas except maybe trying different timers or a lower timer resolution? Andres -- 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/