From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751146AbWDKWII (ORCPT ); Tue, 11 Apr 2006 18:08:08 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751143AbWDKWIH (ORCPT ); Tue, 11 Apr 2006 18:08:07 -0400 Received: from mta07-winn.ispmail.ntl.com ([81.103.221.47]:20108 "EHLO mtaout01-winn.ispmail.ntl.com") by vger.kernel.org with ESMTP id S1751138AbWDKWIG (ORCPT ); Tue, 11 Apr 2006 18:08:06 -0400 Message-ID: <443C2BBA.5010804@gentoo.org> Date: Tue, 11 Apr 2006 23:20:42 +0100 From: Daniel Drake User-Agent: Mail/News 1.5 (X11/20060401) MIME-Version: 1.0 To: John Heffner CC: netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: 2.6.17 regression: Very slow net transfer from some hosts References: <443C03E6.7080202@gentoo.org> <443C024C.2070107@psc.edu> <443C0B74.50305@gentoo.org> <443C09A7.2040900@psc.edu> <443C1738.20605@gentoo.org> <443C178B.3030805@psc.edu> In-Reply-To: <443C178B.3030805@psc.edu> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org John Heffner wrote: > This is almost certainly due to a buggy firewall that doesn't understand > TCP window scaling. I've usually seen this in the past with OpenBSD > firewalls. Do you have one of these in your path? At home I'm behind a Linux gateway box currently running 2.6.15-rc6 - I am connected through ethernet to that. At my student house I am connected wirelessly to a Linksys WRT54Gv5 router (the model that doesnt run Linux). I have reproduced it at both those locations (same ISP). This is very familiar, and I just found the article I was thinking of: http://lwn.net/Articles/92727/ I was also hit by that bug, on the same collection of websites, but that particular problem was fixed for 2.6.8 or so. So I guess it is extremely likely that my ISP has broken routers. nmap isn't able to identify the OS of any ISP routers in my path. It's a huge ISP over here, so contacting them over technical matters is not easy... Thanks, Daniel