What ever happened with this? "eXperimental bandwidth delay product code"

Max Clark max.clark at media.net
Wed Jul 9 11:23:00 PDT 2003

Fantastic, this is exactly what I was looking for.

When you say it's got a specific purpose, I am looking for something that
will dynamically tune a 6Mbit/s, 220ms network link for bulk (500MB) file
transfers. Is this what I think it is, or should I be looking at something

Thanks in advance,

-----Original Message-----
From: Dan Nelson [mailto:dnelson at allantgroup.com]
Sent: Wednesday, July 09, 2003 11:19 AM
To: Max Clark
Cc: freebsd-hackers at freebsd.org
Subject: Re: What ever happened with this? "eXperimental bandwidth delay
product code"

In the last episode (Jul 09), Max Clark said:
> Hi all,
> I am doing research on dynamic tcp tunning, what ever happened with the
> patch below?

It got commited to 4.x and 5.x in August 2002; the sysctls were renamed
to net.inet.tcp.inflight_debug, inflight_enable, and inflight_min.
They're documented in the tcp(4) manpage.  Note that it's got a
specific purpose; you don't want to turn this on by default as it will
lower the throughput of individual TCP streams to prevent backlogs and
packet loss.

	Dan Nelson
	dnelson at allantgroup.com

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