From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Miller Subject: Re: 2.6.20.7 TCP cubic (and bic) initial slow start way too slow? Date: Tue, 12 Jun 2007 15:12:58 -0700 (PDT) Message-ID: <20070612.151258.120619253.davem@davemloft.net> References: <20070512120739.371ada4f.billfink@mindspring.com> <649aecc70705120945q58ae79c9r8ff2dc5557658d1e@mail.gmail.com> <20070516024409.53049682.billfink@mindspring.com> Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Cc: sangtae.ha@gmail.com, rhee@eos.ncsu.edu, shemminger@linux-foundation.org, rhee@ncsu.edu, netdev@vger.kernel.org To: billfink@mindspring.com Return-path: Received: from 74-93-104-97-Washington.hfc.comcastbusiness.net ([74.93.104.97]:53514 "EHLO sunset.davemloft.net" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1750798AbXFLWMm (ORCPT ); Tue, 12 Jun 2007 18:12:42 -0400 In-Reply-To: <20070516024409.53049682.billfink@mindspring.com> Sender: netdev-owner@vger.kernel.org List-Id: netdev.vger.kernel.org From: Bill Fink Date: Wed, 16 May 2007 02:44:09 -0400 > [root@lang2 ~]# netstat -s | grep -i retrans > 25446 segments retransmited > 20936 fast retransmits > 4503 retransmits in slow start > 4 sack retransmits failed > > It then only took 2.14 seconds to transfer 1 GB of data. > > That's all for now. Thanks for all of your testing and numbers Bill. Inhong et al., we have to do something about this, the issue has been known and sitting around for weeks if not months. How safely can we set the default initial_ssthresh to zero in Cubic and BIC?