From mboxrd@z Thu Jan 1 00:00:00 1970 From: Hagen Paul Pfeifer Subject: Re: [PATCH] tcp: Expose the initial RTO via a new sysctl. Date: Wed, 18 May 2011 22:20:25 +0200 Message-ID: <20110518202025.GC4175@nuttenaction> References: <1305715384-81716-1-git-send-email-tsunanet@gmail.com> <20110518.152653.1486764697527722925.davem@davemloft.net> <20110518.155200.801089483916944725.davem@davemloft.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: tsunanet@gmail.com, kuznet@ms2.inr.ac.ru, pekkas@netcore.fi, jmorris@namei.org, yoshfuji@linux-ipv6.org, kaber@trash.net, netdev@vger.kernel.org, linux-kernel@vger.kernel.org To: David Miller Return-path: Content-Disposition: inline In-Reply-To: <20110518.155200.801089483916944725.davem@davemloft.net> Sender: linux-kernel-owner@vger.kernel.org List-Id: netdev.vger.kernel.org * David Miller | 2011-05-18 15:52:00 [-0400]: >I've already changed the initial TCP congestion window in Linux to 10 >without some stupid draft being fully accepted. > >I'll just as easily accept right now a patch right now which lowers >the initial RTO to 1 second and adds the 3 second RTO fallback. I like the idea to make the initial RTO a knob because we in a isolated MANET environment have a RTT larger then 1 second. Especially the link layer setup procedure over several hops demand some time-costly setup time. After that the RTT is <1 second. The current algorithm works great for us. So this RTO change will be counterproductive: it will always trigger a needless timeout. The main problem for us is that Google at all pushing their view of Internet with a lot of pressure. The same is true for the IETF IW adjustments, which is unsuitable for networks which operates at a bandwidth characteristic some years ago. The _former_ conservative principle "TCP over everything" is forgotten. Hagen