What ever happened with this? "eXperimental bandwidthdelayproduct code"

[Max Clark]

First off, thank you everyone who has helped me with this.

After the reading that I have been through this is basically what I've come
to:
throughput = window size / RTT

Which means that if I want a 5Mbit/s throughput and my RTT is 220ms then I
want a window size of 137,500 bytes. Is this inaccurate???

Besides these two sysctls are there any other changes that I should make to
this system?

net.inet.tcp.sendspace
net.inet.tcp.recvspace

Namely should I tweak/enable these sysctls?

net.inet.tcp.msl (The Maximum Segment Lifetime for a packet.)
net.inet.tcp.slowstart_flightsize (The number of packets allowed to be
in-flight during the 	TCP slow-start phase on a non-local network.)
net.inet.tcp.newreno (Enable TCP NewReno Fast Recovery algorithm, as
described in RFC 2582)

I started this thread with a discussion of these features, I am now under
the impression that I do not want to enable/use these sysctls.

net.inet.tcp.inflight_enable
net.inet.tcp.inflight_debug
net.inet.tcp.inflight_min
net.inet.tcp.inflight_max
net.inet.tcp.inflight_stab

Thanks again everyone for their help!

-Max


-----Original Message-----
From: Dirk-Willem van Gulik [mailto:dirkx at webweaving.org]
Sent: Thursday, July 10, 2003 9:07 AM
To: Max Clark
Cc: Terry Lambert; freebsd-hackers at freebsd.org; Dan Nelson
Subject: RE: What ever happened with this? "eXperimental
bandwidthdelayproduct code"




On Thu, 10 Jul 2003, Max Clark wrote:

> > We've done this in the past for protocols such as ftp, http and smtp;
and
> it works wonders.
>
> The protocol is FTP, what sort of proxy are you talking about here? I
would
> like to have...

Commercial/Custom written; mostly based on the apache framework.

                        A                                  B
> ftp server <LAN> freebsd proxy <---Network Link---> freebsd proxy <LAN>
> Windows PC
>
> I assumed that my first step in this configuration is going to be getting
> the two freebsd boxes tuned and performing correctly.

For that just follow:

> 	http://www.faqs.org/rfcs/rfc2488.html

And make sure you have met your requirements between A & B. Once that is
done and confirmed working you can start thinking how to do the proxy
things. There are quite a few ways to do it depening on what sort of use,
user population, number of ftp sites behind the proxy, internet or not,etc.

Dw.