[HECnet] Third Release of Route20 User Mode DECnet Router

[Rob Jarratt]

It would be good to know what the problem was.

 

Regards

 

Rob

 

From: owner-hecnet at Update.UU.SE <owner-hecnet at Update.UU.SE> On Behalf Of Supratim Sanyal
Sent: 11 October 2020 00:25
To: hecnet at update.uu.se
Subject: Re: [HECnet] Third Release of Route20 User Mode DECnet Router

 

This reminds me - I had ROUT20 on Hecnet for months - first on Linux then on FreeBSD - worked great with Bob Armstrong at the other end. I took it off due to reasons I do not remember fully - but was probably when Bob discovered something when we were trying DDCMP ... maybe Bob or Paul remembers more?





---

Supratim Sanyal, W1XMT

39.19151 N, 77.23432 W

QCOCAL::SANYAL via HECnet <http://www.update.uu.se/~bqt/hecnet.html> 

 


On Oct 10, 2020, at 5:55 PM, Rob Jarratt <robert.jarratt at ntlworld.com <mailto:robert.jarratt at ntlworld.com> > wrote:






-----Original Message-----

From: owner-hecnet at Update.UU.SE <mailto:owner-hecnet at Update.UU.SE>  <owner-hecnet at Update.UU.SE <mailto:owner-hecnet at Update.UU.SE> > On Behalf

Of Paul Koning

Sent: 10 October 2020 21:51

To: hecnet at Update.UU.SE <mailto:hecnet at Update.UU.SE> 

Subject: Re: [HECnet] Third Release of Route20 User Mode DECnet Router

 

 

 

On Oct 10, 2020, at 5:11 AM, Rob Jarratt <robert.jarratt at ntlworld.com <mailto:robert.jarratt at ntlworld.com> >

wrote:

 

Hello Everyone,

 

As some of you may be aware, I have been writing my own DECnet router.

Since the last formal release a few years ago I have added a few things, the

details are here https://github.com/rjarratt/Route20. These were all on the Dev

branch, which I know a few people have tried. I have been running the Dev

branch for a long time myself, so I am sure it is stable. All I have done really is

make the current Dev branch “official” by merging it to the master branch.

 

I know Paul has been much more active than me lately on this front, so I am

probably a bit behind, but if anyone would like to take a look that would be

great.

 

I'll have to look at your work, have not done that in a long time.


To be honest, I have never actually looked at PyDECnet! But I should again acknowledge that you have provided me with invaluable help and insight.




 

My 2 cents worth: we're aiming at different things.  I set out to build a full

DECnet implementation in Python, with emphasis on supporting all the parts of

the architecture in a very straightforward way.  Efficiency was very much a

secondary consideration.  As it happens, the performance is not bad, adequate

for a lot of purposes.






 

A C based implement such as you did is somewhat harder to write, but much

more efficient.  For anyone who is running on a slow machine, or under heavy

load, your work is likely to be the right answer.  Also, of course, if you want to

run on a machine where Python is not available or not efficient.

 


My principal aim was to make it portable to as many machines as possible. Not only from a language point of view but also from a resources point of view. For both those reasons C is indeed a better language. So, yes, I think my implementation is likely to work on a wider range of machines. I have not written it to be particularly fast though, my implementation is quite naïve in many respects, because I wanted to keep it simple. I do want to support more parts of DECnet, but time is the usual enemy here.

Regards

Rob

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