20 Mar
2025
20 Mar
'25
5:06 p.m.
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(a)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-…
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(a)whisker.org.uk
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