From owner-cvs-src-old@FreeBSD.ORG Sat May 28 08:34:54 2011 Return-Path: Delivered-To: cvs-src-old@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 751E0106566B for ; Sat, 28 May 2011 08:34:54 +0000 (UTC) (envelope-from lstewart@FreeBSD.org) Received: from repoman.freebsd.org (repoman.freebsd.org [IPv6:2001:4f8:fff6::29]) by mx1.freebsd.org (Postfix) with ESMTP id 634E68FC0C for ; Sat, 28 May 2011 08:34:54 +0000 (UTC) Received: from repoman.freebsd.org (localhost [127.0.0.1]) by repoman.freebsd.org (8.14.4/8.14.4) with ESMTP id p4S8Ysai020446 for ; Sat, 28 May 2011 08:34:54 GMT (envelope-from lstewart@repoman.freebsd.org) Received: (from svn2cvs@localhost) by repoman.freebsd.org (8.14.4/8.14.4/Submit) id p4S8Ys5c020445 for cvs-src-old@freebsd.org; Sat, 28 May 2011 08:34:54 GMT (envelope-from lstewart@repoman.freebsd.org) Message-Id: <201105280834.p4S8Ys5c020445@repoman.freebsd.org> X-Authentication-Warning: repoman.freebsd.org: svn2cvs set sender to lstewart@repoman.freebsd.org using -f From: Lawrence Stewart Date: Sat, 28 May 2011 08:34:30 +0000 (UTC) To: cvs-src-old@freebsd.org X-FreeBSD-CVS-Branch: RELENG_8 Subject: cvs commit: src/sys/modules/cc Makefile src/sys/modules/cc/cc_chd Makefile src/sys/netinet/cc cc_chd.c X-BeenThere: cvs-src-old@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: **OBSOLETE** CVS commit messages for the src tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 28 May 2011 08:34:54 -0000 lstewart 2011-05-28 08:34:30 UTC FreeBSD src repository Modified files: (Branch: RELENG_8) sys/modules/cc Makefile Added files: (Branch: RELENG_8) sys/modules/cc/cc_chd Makefile sys/netinet/cc cc_chd.c Log: SVN rev 222413 on 2011-05-28 08:34:30Z by lstewart MFC 218155: Import an implementation of the CAIA-Hamilton-Delay (CHD) congestion control algorithm described in the paper "Improved coexistence and loss tolerance for delay based TCP congestion control" by Hayes and Armitage. It is implemented as a kernel module compatible with the recently committed modular congestion control framework. CHD enhances the approach taken by the Hamilton-Delay (HD) algorithm to provide tolerance to non-congestion related packet loss and improvements to coexistence with loss-based congestion control algorithms. A key idea in improving coexistence with loss-based congestion control algorithms is the use of a shadow window, which attempts to track how NewReno's congestion window (cwnd) would evolve. At the next packet loss congestion event, CHD uses the shadow window to correct cwnd in a way that reduces the amount of unfairness CHD experiences when competing with loss-based algorithms. In collaboration with: David Hayes and Grenville Armitage Sponsored by: FreeBSD Foundation Reviewed by: bz and others along the way Revision Changes Path 1.6.2.7 +2 -1 src/sys/modules/cc/Makefile 1.1.2.2 +9 -0 src/sys/modules/cc/cc_chd/Makefile (new) 1.3.2.2 +497 -0 src/sys/netinet/cc/cc_chd.c (new)