From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1763554AbXJRJmp (ORCPT ); Thu, 18 Oct 2007 05:42:45 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1759466AbXJRJmd (ORCPT ); Thu, 18 Oct 2007 05:42:33 -0400 Received: from ioctl.codeblau.de ([80.190.240.67]:37049 "EHLO codeblau.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1756084AbXJRJmc (ORCPT ); Thu, 18 Oct 2007 05:42:32 -0400 Date: Thu, 18 Oct 2007 11:42:30 +0200 From: Felix von Leitner To: Rick Jones Cc: Chuck Ebbert , linux-kernel@vger.kernel.org, Netdev Subject: Re: bizarre network timing problem Message-ID: <20071018094230.GA2978@codeblau.de> References: <20071017205127.GA21334@codeblau.de> <47167BDE.4000103@redhat.com> <20071017220019.GA22765@codeblau.de> <471689BF.2040909@hp.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <471689BF.2040909@hp.com> User-Agent: Mutt/1.5.13 (2006-08-11) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org > the packet trace was a bit too cooked perhaps, but there were indications > that at times the TCP window was going to zero - perhaps something with > window updates or persist timers? Does TCP use different window sizes on loopback? Why is this not happening on ethernet? How could I test this theory? My initial idea was that it has something todo with the different MTU on loopback. My initial block size was 16k, but the problem stayed when I changed it to 64k. Felix