Date: Wed, 12 Jul 2017 14:36:12 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 220677] [patch] Add support for TCP ABE draft-khademi-tcpm-alternativebackoff-ecn Message-ID: <bug-220677-8@https.bugs.freebsd.org/bugzilla/>
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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.=
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