From owner-freebsd-net@FreeBSD.ORG Wed Jan 30 17:29:54 2013 Return-Path: Delivered-To: freebsd-net@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by hub.freebsd.org (Postfix) with ESMTP id 3B6A45FA for ; Wed, 30 Jan 2013 17:29:54 +0000 (UTC) (envelope-from andre@freebsd.org) Received: from c00l3r.networx.ch (c00l3r.networx.ch [62.48.2.2]) by mx1.freebsd.org (Postfix) with ESMTP id 97011A6C for ; Wed, 30 Jan 2013 17:29:53 +0000 (UTC) Received: (qmail 90573 invoked from network); 30 Jan 2013 18:49:51 -0000 Received: from c00l3r.networx.ch (HELO [127.0.0.1]) ([62.48.2.2]) (envelope-sender ) by c00l3r.networx.ch (qmail-ldap-1.03) with SMTP for ; 30 Jan 2013 18:49:51 -0000 Message-ID: <5109588D.9070504@freebsd.org> Date: Wed, 30 Jan 2013 18:29:49 +0100 From: Andre Oppermann User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20130107 Thunderbird/17.0.2 MIME-Version: 1.0 To: Alfred Perlstein 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> In-Reply-To: <5109543B.4020304@mu.org> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: Sepherosa Ziehau , freebsd-net@freebsd.org, Bjoern Zeeb , John Baldwin 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 17:29:54 -0000 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. -- Andre