> VAXELN is new to me, but I am reasonably at home in the internals of RSX11M,
> MTS and OS 360. I was called in by the application programmer when he
> encountered a somewhat deep problem.
> One or two times a month in the 3rd of three RT1000 running V4.0 of VAXELN
> the two communications tasks with the microVax 3300 running VMS 5.2 stop.
> One with access violation, reason mask 05 and one with access violation or
> with a kernel stack not valid exception. These tasks are identical and each
> serves its own sorting unit. The VAXELN systems use the DDCMP_V2 module. The
> systems run continuously. The stop address is for both tasks always in the
> DAP module (from june 7 1989) at 1FFC from the start
> It looks as if the FP register contains 0 during the last CLRB -4C4(FP)
> intruction.I conclude this from the virtual address =FFFFFB3C message..
> The system stopped at the same location during startup earlier in the
> project each time when the 3rd realtime vax was started, but then:maximum
> links was 32 and maximum circuits was16. This error disappeared when these
> quantities were doubled to maximum links=64 and maximum circuits=32. The
> earlier values were ok during the years when only two realtime vaxes were
> active.and with 2 realtime vaxes these crashes were not noticed.
> The realtime vaxes all have the remote debugger. The installation is 140 km
> from my home.
> It looks as if register information is hard to get at. Suggestions?
> Has anyone encountered a similar error? Who has suggestions?.
> When this gets highly detailed contact off list might be best.
[I'd trim the above if it didn't mean cutting something out
that should stay]
First off, In my experience with VAXELN 4.x you can see these
sort of failures due to excess network traffic. We solved that
problem by isolating the VAXELN system on a local network and
put two network interfaces in the VMS system and set it up as
a DECnet router (because we needed the VMS system to talk to
both networks).
If there's not a problem with increasing maximum links and
maximum circuits, and that solves the problem, then you can
just leave those values doubled.
--
Eric Dittman
dittman_at_dittman.net
Check out the DEC Enthusiasts Club at http://www.dittman.net/
Received on Sat Feb 08 2003 - 11:31:01 GMT