From owner-freebsd-net@FreeBSD.ORG Wed Jan 30 17:32:33 2013 Return-Path: Delivered-To: freebsd-net@freebsd.org Received: from mx1.freebsd.org (mx1.FreeBSD.org [8.8.178.115]) by hub.freebsd.org (Postfix) with ESMTP id D067279D for ; Wed, 30 Jan 2013 17:32:33 +0000 (UTC) (envelope-from bright@mu.org) Received: from elvis.mu.org (elvis.mu.org [192.203.228.196]) by mx1.freebsd.org (Postfix) with ESMTP id B3A72A98 for ; Wed, 30 Jan 2013 17:32:33 +0000 (UTC) Received: from Alfreds-MacBook-Pro-9.local (ool-45775fce.dyn.optonline.net [69.119.95.206]) by elvis.mu.org (Postfix) with ESMTPSA id 331AD1A3C77 for ; Wed, 30 Jan 2013 09:32:33 -0800 (PST) Message-ID: <51095930.1050900@mu.org> Date: Wed, 30 Jan 2013 12:32:32 -0500 From: Alfred Perlstein User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.7; rv:17.0) Gecko/20130107 Thunderbird/17.0.2 MIME-Version: 1.0 To: freebsd-net@freebsd.org Subject: Re: [PATCH] Add a new TCP_IGNOREIDLE socket option References: <201301221511.02496.jhb@freebsd.org> <201301291350.39931.jhb@freebsd.org> <5108562A.1040603@freebsd.org> <201301301158.33838.jhb@freebsd.org> <5109543B.4020304@mu.org> <5109588D.9070504@freebsd.org> In-Reply-To: <5109588D.9070504@freebsd.org> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 30 Jan 2013 17:32:33 -0000 On 1/30/13 12:29 PM, Andre Oppermann wrote: > On 30.01.2013 18:11, Alfred Perlstein wrote: >> On 1/30/13 11:58 AM, John Baldwin wrote: >>> On Tuesday, January 29, 2013 6:07:22 pm Andre Oppermann wrote: >>>> >>>> Yes, unfortunately I do object. This option, combined with the >>>> inflated >>>> CWND at the end of a burst, effectively removes much, if not all, >>>> of the >>>> congestion control mechanisms originally put in place to allow >>>> multiple >>>> [TCP] streams co-exist on the same pipe. Not having any decay or >>>> timeout >>>> makes it even worse by doing this burst after an arbitrary amount >>>> of time >>>> when network conditions and the congestion situation have certainly >>>> changed. >>> You have completely ignored the fact that Linux has had this as a >>> global >>> option for years and the Internet has not melted. A socket option >>> is far more >>> fine-grained than their tunable (and requires code changes, not >>> something a >>> random sysadmin can just toggle as "tuning"). >> >> I agree with John here. >> >> While Andre's objection makes sense, since the majority of Linux/Unix >> hosts now have this as a >> global option I can't think of why you would force FreeBSD to be a >> final holdout. > > Unless OpenBSD, NetBSD, Solaris/Ilumos also support this it is hardly a > majority of Linux/Unix hosts. And this isn't something a "sysadmin" > should > tune at all. > My apologies, I should have been more clear. I was speaking of majority of install base, not majority of distros. -Alfred