Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Tue, 7 Nov 2000 02:14:20 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Tue, 7 Nov 2000 02:14:10 -0500 Received: from pizda.ninka.net ([216.101.162.242]:41602 "EHLO pizda.ninka.net") by vger.kernel.org with ESMTP id ; Tue, 7 Nov 2000 02:14:03 -0500 Date: Mon, 6 Nov 2000 22:59:04 -0800 Message-Id: <200011070659.WAA02448@pizda.ninka.net> From: "David S. Miller" To: ak@suse.de CC: jordy@napster.com, linux-kernel@vger.kernel.org, kuznet@ms2.inr.ac.ru In-Reply-To: <20001107080342.A2159@gruyere.muc.suse.de> (message from Andi Kleen on Tue, 7 Nov 2000 08:03:42 +0100) Subject: Re: Poor TCP Performance 2.4.0-10 <-> Win98 SE PPP In-Reply-To: <3A07662F.39D711AE@napster.com> <200011070428.UAA01710@pizda.ninka.net> <3A079127.47B2B14C@napster.com> <200011070533.VAA02179@pizda.ninka.net> <3A079D83.2B46A8FD@napster.com> <200011070603.WAA02292@pizda.ninka.net> <20001107080342.A2159@gruyere.muc.suse.de> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Date: Tue, 7 Nov 2000 08:03:42 +0100 From: Andi Kleen It looks very like to me like a poster child for the non timestamp RTT update problem I just described on netdev. Linux always retransmits too early and there is never a better RTT estimate which could fix it. I thought so too, _BUT_ see my analysis of the Linux side vs. Win98 side logs, they don't match up and therefore something is mangling the packets in the middle. The TCP sequence numbers are being changed! Also, if your theory were true then 2.2.x would be affected by it as well. Later, David S. Miller davem@redhat.com - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/