I was just reviewing http://www.mentat.com/xtp/xtp.html and
http://www.ca.sandia.gov/xtp/. XTP looks like a very interesting protocol.
It provides all the features of TCP, plus built-in realiable multicasts, better
speed over networks with packet loss, better speed overall, maximum bandwidth
limiting built-in, and a few other features which make it noteworthy.
It appears that they have defined a few protocols over XTP already, including
SMTP and FTP.
Is there any projects out there to add XTP to the standard linux kernel?
Jordan Mendelson : http://jordy.wserv.com
Web Services, Inc. : http://www.wserv.com
On Wed, Jun 02, 1999 at 09:38:59AM +0100, Philip Blundell wrote:
> >I was just reviewing http://www.mentat.com/xtp/xtp.html and
> >http://www.ca.sandia.gov/xtp/. XTP looks like a very interesting protocol.
> I did some work with XTP a few years back. It's interesting but it's a very
> heavyweight protocol compared to TCP. It tries to be all things to all men
> and it's debatable whether it really succeeds.
> It would certainly be worth having in the kernel, however.
I think a much more interesting protocol to have in the kernel would
be Bell Labs' IL. It's implemented in Plan 9, and they say they are
very happy with its performance. It's a sequenced packet protocol,
ideal for NFS, CORBA messages and pretty much anything which currently
either implements its own out-of-order + retransmit strategy over UDP
or puts packet boundaries into TCP.
There's a description of the protocol at
I have the barest bones of a start at a linux implementation of it,
if anyone wants to collaborate :-)
Matthew Wilcox <[email protected]>
"Windows and MacOS are products, contrived by engineers in the service of
specific companies. Unix, by contrast, is not so much a product as it is a
painstakingly compiled oral history of the hacker subculture." - N Stephenson
I've been working on an XTP implementation for Linux for some time
(and will be the first to admit that I'm order due for releasing
I recently ported it to kernel 2.3.x and am in the process of (re)sending
a patch to David.
I'm doing this strictly on a volunteer basis, which means I can respond to
during the evenings and have limitted time for its development--but unlimitted
interested in its growth and potential. More info will follow.
Quick synopsis of XTP:
XTP is quite flexible and versatile, capable of offering UDP-like and TCP-like
services--and everything in between--in one protocol stack. However, its
is also its weak point. There is little public
on making XTP work in an IP environment, hence this XTP-Linux project.
There are also several transport issues that need to be explored in an XTP/IP
If anyone is really interested in this and wants to help out, let me know
"David S. Miller" wrote:
> Date: Tue, 01 Jun 1999 17:10:30 -0400
> From: Jordan Mendelson <[email protected]>
> Is there any projects out there to add XTP to the standard linux
> There is someone who is working on XTP/Linux and keeps sending me
> patches, but they always need massive formatting cleanups before I can
> apply them and then he disappears again for a few months.
> This is not necessarily his fault, he may not have the time to finish
> up and submit patches cleanly, but until _someone_ does this work I
> cannot even put his work in progress code into the tree.
> David S. Miller
> [email protected]
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