From mboxrd@z Thu Jan 1 00:00:00 1970 From: "John Heffner" Subject: Re: about Linux adaptivly adjusting ssthresh Date: Wed, 27 Aug 2008 15:48:44 -0700 Message-ID: <1e41a3230808271548w15164eadt1042f37bf2df7e6f@mail.gmail.com> References: <1e41a3230804151540i1f7cee4dva6adc6ef25dae546@mail.gmail.com> <20080416.012732.152357000.davem@davemloft.net> <20080416.023551.70464279.davem@davemloft.net> <000001c90852$a1c19a50$a05ee183@D2GT6T71> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: "David Miller" , ilpo.jarvinen@helsinki.fi, netdev@vger.kernel.org To: wenji@fnal.gov Return-path: Received: from an-out-0708.google.com ([209.85.132.247]:12503 "EHLO an-out-0708.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753038AbYH0Wsp (ORCPT ); Wed, 27 Aug 2008 18:48:45 -0400 Received: by an-out-0708.google.com with SMTP id d40so15876and.103 for ; Wed, 27 Aug 2008 15:48:44 -0700 (PDT) In-Reply-To: <000001c90852$a1c19a50$a05ee183@D2GT6T71> Content-Disposition: inline Sender: netdev-owner@vger.kernel.org List-ID: On Wed, Aug 27, 2008 at 7:38 AM, Wenji Wu wrote: > > Hi, all, > > Could anybody help me out with Linux adaptively adjusting ssthresh? Thanks > in advance. > > I understand that the latest Linux is able to adaptively adjust ssthresh to > avoid retransmission. Could anybody tell me which algorithms have been > implemented for the adaptive ssthresh adjust? A little more detail would be helpful. Are you referring to caching ssthresh between connections, or something going on during a connection? Various congestion control modules use ssthresh differently, so a comprehensive answer would be difficult. -John