Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261797AbTFDFVI (ORCPT ); Wed, 4 Jun 2003 01:21:08 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262874AbTFDFVI (ORCPT ); Wed, 4 Jun 2003 01:21:08 -0400 Received: from palrel13.hp.com ([156.153.255.238]:23261 "EHLO palrel13.hp.com") by vger.kernel.org with ESMTP id S261797AbTFDFVH (ORCPT ); Wed, 4 Jun 2003 01:21:07 -0400 From: David Mosberger MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <16093.34022.445246.52398@napali.hpl.hp.com> Date: Tue, 3 Jun 2003 22:34:30 -0700 To: Nivedita Singhvi Cc: davidm@hpl.hp.com, "David S. Miller" , kuznet@ms2.inr.ac.ru, jmorris@intercode.com.au, gandalf@wlug.westbo.se, linux-kernel@vger.kernel.org, linux-ia64@linuxia64.org, netdev@oss.sgi.com, akpm@digeo.com Subject: Re: fix TCP roundtrip time update code In-Reply-To: <3EDD7832.7010804@us.ibm.com> References: <200306040043.EAA24505@dub.inr.ac.ru> <3EDD52F5.8090706@us.ibm.com> <20030603.202320.59680883.davem@redhat.com> <16093.30507.661714.676184@napali.hpl.hp.com> <3EDD7832.7010804@us.ibm.com> X-Mailer: VM 7.07 under Emacs 21.2.1 Reply-To: davidm@hpl.hp.com X-URL: http://www.hpl.hp.com/personal/David_Mosberger/ Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1581 Lines: 39 >>>>> On Tue, 03 Jun 2003 21:40:18 -0700, Nivedita Singhvi said: Nivedita> David Mosberger wrote: DaveM> So if your old SpecWEB99 lab tended more to trigger timeout DaveM> based retransmits on LAN, and your new test network does not, DaveM> then your new test network will tend to not reproduce the bug DaveM> regardless of whether the bug is present in the kernel or not DaveM> :-) >> Is this where I get to plug httperf? It triggered the bug >> reliably in less than 10 secs. ;-) Nivedita> Tarnation!! Ran httperf! Didnt hit it! :(. What were your Nivedita> settings? I used: $ httperf --rate 1000 --num-conns 1000000 --verbose --hog --server HOST \ --uri pathto30KBfile on 3 clients (for a total of 3000 conns/sec). You can't go higher than 1000 conn/sec per client (IP address) because otherwise you run out of port space (due to TIME_WAIT). This load worked well for a machine with a single GigE card. All network tunables were on the default setting (in particular, the tx queue len was 300, which is were the losses came from). With this load, I saw bad RTT values in the route cache within a couple of seconds after starting the third httperf generator. It then took a bit longer (on the order of 1-2 minutes) until the first TCPAbortFailed errors started to pop up. --david - 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/