I can't help much other than to confirm that I have a Decnet-Plus (aka Phase V) system running 7.3 on a simulated Q-Bus Ethernet adapter, and it generally works fine with no performance issues.  This is on a Raspberry Pi5 with latest OS and a version of open-simh from about a year or so ago.

In your shoes, I'd probably start with Wireshark and see if I could work out where the packets are going missing, and/or turn on appropriate debugging in simh.

On Thu, 20 Mar 2025 at 15:31, Peter Whisker <peter@whisker.org.uk> wrote:

Hi

 

Recently I cloned one of my MicroVAX 7.3 simh servers and removed DECnet phase IV from it (which works perfectly) and installed DECnet-Plus from the distribution. I set it up with the same details as for Phase IV and configured the same MAC and area/node – clearly I will not boot both at the same time! The simh setup is identical for both version of the server apart for my having increased memory from 128M to 256M to see if that helped (it didn’t).

 

It sort-of works, there is connectivity and adjacencies as I would expect but it is extremely slow. If I “set host” to another machine, or from another machine to it, it works extremely slowly, I see 3 second retries happening all the time.

 

The command “SHOW NSP LOCAL NSAP <local_nsap> REMOTE NSAP * retransmitted pdus, duplicate pdus received” suggested here https://community.hpe.com/t5/operating-system-openvms/very-bad-performance-over-native-decnet/td-p/5000605 shows the retransmit count going up.

 

The adjacencies are on ethernet LAN – has anyone got any experience of this problem which  might suggest what is happening?

 

Thanks

Peter

 

Peter R Whisker BA BAI CEng MIET

Chartered Engineer – IT Technical Architect

T: +44 1932 842536

M: +44 7870 171768

E: peter@whisker.org.uk

 

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