From mboxrd@z Thu Jan 1 00:00:00 1970 From: davef1624@aol.com Subject: Re: TCP congestion control for fast, short-distance networks ? Date: Wed, 04 Apr 2007 16:15:13 -0400 Message-ID: <8C9450D169515E6-244-1CF0@FWM-D41.sysops.aol.com> References: <20070404153911.GA32019@galon.ev-en.org> <8C944E930D99B5D-244-E4B@FWM-D41.sysops.aol.com> <20070404161121.GB32019@galon.ev-en.org> <20070404.125546.87742905.davem@davemloft.net> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed Content-Transfer-Encoding: 7bit Cc: shemminger@linux-foundation.org, netdev@vger.kernel.org To: davem@davemloft.net, baruch@ev-en.org Return-path: Received: from imo-m28.mx.aol.com ([64.12.137.9]:58697 "EHLO imo-m28.mx.aol.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752578AbXDDUPe (ORCPT ); Wed, 4 Apr 2007 16:15:34 -0400 In-Reply-To: <20070404.125546.87742905.davem@davemloft.net> Sender: netdev-owner@vger.kernel.org List-Id: netdev.vger.kernel.org thanks for your help - I'll investigate turning on 802.3 level flow control -----Original Message----- From: davem@davemloft.net To: baruch@ev-en.org Cc: davef1624@aol.com; shemminger@linux-foundation.org; netdev@vger.kernel.org Sent: Wed, 4 Apr 2007 12:55 PM Subject: Re: TCP congestion control for fast, short-distance networks ? From: Baruch Even Date: Wed, 4 Apr 2007 19:11:21 +0300 > * davef1624@aol.com [070404 19:03]: > > Thanks - so you are suggesting we enable 802.3 flow-control / pause-frames? > > (it's currently disabled) > > I do, but do test it before you bet on it. I've never tested such a > scenario but from my experience the lower the rtt the lesser are the > problems that the high speed algorithms are trying to solve. Congestion control, at the TCP level, is from one perspective completely senseless on local high-speed networks. The reason is that once any kind of congestion at that level is detected, the condition is gone by the time you could even possibly respond to it. So with that in mind, reno is as good as anything and yes do use pause frames. - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html ________________________________________________________________________ AOL now offers free email to everyone. Find out more about what's free from AOL at AOL.com.