From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Mon, 8 Jan 2001 09:07:41 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Mon, 8 Jan 2001 09:07:31 -0500 Received: from smtpgw.bnl.gov ([130.199.3.16]:28678 "EHLO smtpgw.sec.bnl.local") by vger.kernel.org with ESMTP id ; Mon, 8 Jan 2001 09:07:27 -0500 Date: Mon, 8 Jan 2001 09:06:45 -0500 From: Tim Sailer To: Andrew Morton Cc: linux-kernel@vger.kernel.org, jfung@bnl.gov Subject: Re: Network Performance? Message-ID: <20010108090644.A12440@bnl.gov> In-Reply-To: <20010104013340.A20552@bnl.gov>, <20010104013340.A20552@bnl.gov>; <20010105140021.A2016@bnl.gov> <3A56FD6C.93D09ABB@uow.edu.au>, <3A56FD6C.93D09ABB@uow.edu.au>; <20010107235123.B6028@bnl.gov> <3A5995CF.7AEFFBBD@uow.edu.au> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.3.12i In-Reply-To: <3A5995CF.7AEFFBBD@uow.edu.au>; from andrewm@uow.edu.au on Mon, Jan 08, 2001 at 09:26:23PM +1100 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Jan 08, 2001 at 09:26:23PM +1100, Andrew Morton wrote: > Tim Sailer wrote: > > > > On Sat, Jan 06, 2001 at 10:11:40PM +1100, Andrew Morton wrote: > > > this issue was discussed on the netdev mailing list a few weeks > > > back. > > > > > > It's very unfortunate that the web archives of netdev > > > stopped working several months ago and there now appears > > > to be no web archive of netdev@oss.sgi.com. > > > > > > Go to http://oss.sgi.com/projects/netdev/archive/ and > > > pull down the November and December archives. > > > > > > The subject was "linux to solaris tcp issues on WAN". > > > > > > The conclusion was "The problem is also fixed with > > > 2.4.0-test12pre3". Dunno about kernel 2.2 though. > > > > Well, on Friday, we pulled down the 'official' 2.4.0, and had the > > same experience... nothing better. Should I get the -test12-pre3 kernel > > and try that one specifically? > > I doubt if that would help. > > I claim no expertise in this area, but perhaps we can > get some protocol gurus interested. > > To recap: > > You're sending and receiving FTP/TCP/IP4 to Solaris and AIX hosts Yup > You have a 1000kbyte window size Yup > You have an 80 megabit/sec pipe. Actually, 100 to the router, and then the WAN connection to the remote system is OC-3 > You're getting 1.8 megabits/sec. Yup > What is the round-trip time on the WAN? > > Packet loss? 101 packets transmitted, 101 packets received, 0% packet loss round-trip min/avg/max = 109.6/110.3/112.2 ms > Does the problem occur in both directions? Good question. I'll find out. > Are you _sure_ the window size is being set correctly? How > is it being set? I'm fairly sure. We echo the value to the file. catting it back shows the correct value. If we go lower than default, it slows down even more. > Are you able to generate TCP dumps when the problem is happening? We can, if it will help. Tim -- Tim Sailer Cyber Security Operations Brookhaven National Laboratory (631) 344-3001 - 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/