What ever happened with this? "eXperimental bandwidth delay
max.clark at media.net
Wed Jul 9 12:24:40 PDT 2003
> 6000000/8*.220 = 165Kbytes or 1.32Mbit/s
I understand the BDP concept and the calculation to then generate the tcp
window sizes. What I don't understand is this...
How in the world is a windows 2000 box running commercial software able to
push this link to 625KByte/s (5Mbit/s)????
How can I get similar results with FreeBSD? I don't care about any other
traffic on the network at the same time as my transfer, just the raw
performance of my transfer.
From: Dan Nelson [mailto:dnelson at allantgroup.com]
Sent: Wednesday, July 09, 2003 12:02 PM
To: Max Clark
Cc: freebsd-hackers at freebsd.org
Subject: Re: What ever happened with this? "eXperimental bandwidth delay
In the last episode (Jul 09), Max Clark said:
> 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 else?
Unless you're doing multiple simultaneous TCP connections it'll only
slow you down. Your bw*delay product is 6000000/8*.220 = 165Kbytes, so
telling ncftp to set its so-bufsize to say 200K, and telling your ftp
daemon to do the same thing, should be all you need.
dnelson at allantgroup.com
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