[Tmrg] Proposal to increase TCP initial CWND
fred at cisco.com (Fred Baker) Mon, 19 July 2010 14:11 UTC
From: "fred at cisco.com"
Date: Mon, 19 Jul 2010 07:11:14 -0700
Subject: [Tmrg] Proposal to increase TCP initial CWND
In-Reply-To: <AANLkTimFEGfPJo9rjTw6oNPmwuHkEFBmAX1Ps2yYsUWh@mail.gmail.com>
References: <AANLkTil937lyUzRvUtdqd2qdl9RN7AZ-Mo_cT-dtmqXz@mail.gmail.com> <923833DA-FC31-4D30-96A5-48D4D072DBD3@cisco.com> <AANLkTimFEGfPJo9rjTw6oNPmwuHkEFBmAX1Ps2yYsUWh@mail.gmail.com>
Message-ID: <67225862-FF5A-4B3B-B681-C07E5A705B35@cisco.com>
"Typical" varies by vendor and software implementation. On Cisco products, the default IOS configuration gives 40 buffers in the queue. On Jul 19, 2010, at 1:12 AM, Jerry Chu wrote: > On Sat, Jul 17, 2010 at 11:53 PM, Fred Baker <fred at cisco.com> wrote: >> >> This is essentially the point of concern I raised to them; I also raised the point that what works well in the broadband Internet is quite a bit different than Internet access in parts of the world that have slower typical access rates. > > I'd like to point out Google's services are not restricted to just > broadband users. Also from our experiements > some of the greatest latency improvments of a larger IW seem to have > come from users behind slow or highly > multiplexed links. > > Do you know how much buffer space a typical dial-up (e.g., 56Kbps) > access router provides? > > Jerry > >> >> On Jul 17, 2010, at 11:27 PM, Lachlan Andrew wrote: >> >>> - An increase in retransmissions from 3.94% to 5.79% seems very >>> significant, if that rate reflects the loss rate. Although described >>> as a 1.85% increase, it seems likely to cause competing traffic to >>> slow down by a factor of sqrt(5.79/3.94). Moreover, that is the >>> increase in loss when (presumably) a *single* flow on that bottleneck >>> increases its initial window. How can we estimate the impact of *all* >>> flows increasing their initial windows? >> >> http://www.ipinc.net/IPv4.GIF >> http://www.ipinc.net/IPv4.GIF
- [Tmrg] Proposal to increase TCP initial CWND Lachlan Andrew
- [Tmrg] Proposal to increase TCP initial CWND Fred Baker
- [Tmrg] Proposal to increase TCP initial CWND Lachlan Andrew
- [Tmrg] Proposal to increase TCP initial CWND SCHARF, Michael
- [Tmrg] Proposal to increase TCP initial CWND Aleksandar Milenkoski
- [Tmrg] Proposal to increase TCP initial CWND Lachlan Andrew
- [Tmrg] Proposal to increase TCP initial CWND Fred Baker
- [Tmrg] Proposal to increase TCP initial CWND Fred Baker
- [Tmrg] Proposal to increase TCP initial CWND Stefan Hirschmann
- [Tmrg] Proposal to increase TCP initial CWND Fred Baker
- [Tmrg] Proposal to increase TCP initial CWND Lachlan Andrew
- [Tmrg] Proposal to increase TCP initial CWND Fred Baker
- [Tmrg] Proposal to increase TCP initial CWND Fred Baker
- [Tmrg] Proposal to increase TCP initial CWND Fred Baker
- [Tmrg] Proposal to increase TCP initial CWND Stefan Hirschmann
- [Tmrg] Proposal to increase TCP initial CWND Stefan Hirschmann
- [Tmrg] Proposal to increase TCP initial CWND Fred Baker
- [Tmrg] Proposal to increase TCP initial CWND Yuchung Cheng
- [Tmrg] Proposal to increase TCP initial CWND Lachlan Andrew