From owner-freebsd-bugs@freebsd.org Wed Jul 12 14:36:12 2017 Return-Path: Delivered-To: freebsd-bugs@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id B56B5D98EE1 for ; Wed, 12 Jul 2017 14:36:12 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2001:1900:2254:206a::16:76]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id A34B864A97 for ; Wed, 12 Jul 2017 14:36:12 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from bugs.freebsd.org ([127.0.1.118]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id v6CEaCPn069334 for ; Wed, 12 Jul 2017 14:36:12 GMT (envelope-from bugzilla-noreply@freebsd.org) From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 220677] [patch] Add support for TCP ABE draft-khademi-tcpm-alternativebackoff-ecn Date: Wed, 12 Jul 2017 14:36:12 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: kern X-Bugzilla-Version: CURRENT X-Bugzilla-Keywords: patch X-Bugzilla-Severity: Affects Only Me X-Bugzilla-Who: jones@sdf.org X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: freebsd-bugs@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_id short_desc product version rep_platform op_sys bug_status keywords bug_severity priority component assigned_to reporter attachments.created Message-ID: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: freebsd-bugs@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Bug reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 12 Jul 2017 14:36:12 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D220677 Bug ID: 220677 Summary: [patch] Add support for TCP ABE draft-khademi-tcpm-alternativebackoff-ecn Product: Base System Version: CURRENT Hardware: Any OS: Any Status: New Keywords: patch Severity: Affects Only Me Priority: --- Component: kern Assignee: freebsd-bugs@FreeBSD.org Reporter: jones@sdf.org Keywords: patch Created attachment 184306 --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=3D184306&action= =3Dedit Patch This patch adds support Alternative Backoff ECN for TCP with the New Reno congestion control module. TCP ABE is described in https://tools.ietf.org/html/draft-khademi-tcpm-alternativebackoff-ecn-01 ABE updates the TCP sender-side reaction to congestion notification received via Explicit Congestion Notifiction (ECN) marks. From the Abstract in the draft: The updated method reduces FlightSize in Congestion Avoidance by a smaller amount than the TCP reaction to loss. The intention is to achieve good throughput when the queue at the bottleneck is smaller than the bandwidth-delay-product of the connection. This is more likely when an Active Queue Management (AQM) mechanism has used ECN to CE-mark a packet, than when a packet was lost. This patch adds 3 new sysctl values, one to control the use of ABE and two = new cc controls under net.inet.tcp.cc.newreno to control the loss and ecn respo= nse factors. These controls are intended to aid future experimentation and rese= arch in this area. net.inet.tcp.abe: Toggles whether a transport uses the new abe conditions. Currently only implemented for New Reno. net.inet.tcp.cc.newreno.beta_ecn: The factor used to change FlightSize in response to an ecn mark, defaul= ts to 0.8 as described in the draft. net.inet.tcp.cc.newreno.beta_loss: The factor used to change FlightSize in response to a loss event, defau= lts to 0.5 as described in the draft. This patch is a port of the same functionality implemented by Naeem Khademi= and is available here: http://heim.ifi.uio.no/~naeemk/research/ABE/diff-0d38090e881d-newrenoVB-7ja= n15.txt --=20 You are receiving this mail because: You are the assignee for the bug.=