From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stephen Hemminger Subject: Re: [PATCH] CUBIC v2.3 with new improved slow start Date: Mon, 3 Nov 2008 14:49:23 -0800 Message-ID: <20081103144923.244158f3@extreme> References: <006001c93a0d$477d4e30$4a580e98@ncsu2cc0c3fa00> <20081102.002736.193701976.davem@davemloft.net> <649aecc70811031419o78e9046eu52adf78eef8da7d7@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Cc: "David Miller" , "Rick Jones" , rhee@eos.ncsu.edu, netdev@vger.kernel.org To: "Sangtae Ha" Return-path: Received: from mail.vyatta.com ([76.74.103.46]:45153 "EHLO mail.vyatta.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752800AbYKCWt2 (ORCPT ); Mon, 3 Nov 2008 17:49:28 -0500 In-Reply-To: <649aecc70811031419o78e9046eu52adf78eef8da7d7@mail.gmail.com> Sender: netdev-owner@vger.kernel.org List-ID: On Mon, 3 Nov 2008 17:19:52 -0500 "Sangtae Ha" wrote: > Hi all, > > We had rather extensive testings with one MacOSX receiver of the > latest Leopard release. > As we had one macbook pro available in the lab, all the testing > results are with the one receiver. > Based on the tested results, MacOSX also doesn't break the algorithm. > > Please see the results at the following: > > http://netsrv.csc.ncsu.edu/wiki/index.php/TCP_Testing#Testing_with_MacOSX > > One thing I observed with FreeBSD and MacOS receivers is that > even though we set the large send and recv buffer and run the iperf > with the large fixed memory, > without manually setting the window scale parameter to a higher value, > the receiver window is limited to 64K << 3 (which is the default of MacOSX). > > Because of that, I had to set the window scailing parameter from 3 to > 13 manually. > This also affects SACK not triggering with the default window scale factor of 3. > Linux certainly doesn't have this problem. > > Probably, MacOSX and FreeBSD may need some updates for this issue. > > Thank you for all your feedbacks, > > Sangtae Thanks for the pro-active testing.