From owner-freebsd-net@FreeBSD.ORG Tue Jun 17 08:48:50 2014 Return-Path: Delivered-To: freebsd-net@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 75C581C9 for ; Tue, 17 Jun 2014 08:48:50 +0000 (UTC) Received: from onlyone.friendlyhosting.spb.ru (onlyone.friendlyhosting.spb.ru [46.4.40.135]) by mx1.freebsd.org (Postfix) with ESMTP id 33F712494 for ; Tue, 17 Jun 2014 08:48:49 +0000 (UTC) Received: from lion.home.serebryakov.spb.ru (unknown [IPv6:2001:470:923f:1:1c4b:cac4:59c6:f7d9]) (Authenticated sender: lev@serebryakov.spb.ru) by onlyone.friendlyhosting.spb.ru (Postfix) with ESMTPSA id 0483F4AC0C; Tue, 17 Jun 2014 12:48:46 +0400 (MSK) Date: Tue, 17 Jun 2014 12:48:43 +0400 From: Lev Serebryakov Reply-To: lev@FreeBSD.org Organization: FreeBSD Project X-Priority: 3 (Normal) Message-ID: <1819611615.20140617124843@serebryakov.spb.ru> To: hiren panchasara Subject: Re: LEDBAT (RFC-6817)i n FreeBSD as mod_cc(9)? In-Reply-To: References: <1863738251.20140616172546@serebryakov.spb.ru> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Cc: "freebsd-net@freebsd.org" X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 17 Jun 2014 08:48:50 -0000 Hello, hiren. You wrote 17 =D0=B8=D1=8E=D0=BD=D1=8F 2014 =D0=B3., 11:41:35: >> It looks like, that some TCP connections could benefit from LEDBAT >> (RFC-6871) cognestion control algorithm (not all, of course, it should = not >> be default). >> >> Also, it looks like Apple implements one >> (http://www.opensource.apple.com/source/xnu/xnu-1699.32.7/bsd/netinet/= tcp_ledbat.c), >> but it uses much more "callbacks" from TCP/SCTP core to CC module, that >> FreeBSD has. >> >> Does somebody evaluate, is it possible to bring LEDBAT to FreeBSD? hp> I'd guess there is nothing wrong in having this as a cc module. hp> Someone has to do the necessary legwork :-) The problem is it seems that "someone" needs to extend set of hooks in mod_cc substantially. It is more than "write one more module" and, IMHO, should be discussed with net-related people :) --=20 // Black Lion AKA Lev Serebryakov