Excessive amount of time in interrupt stack mode

Patrick Finnegan vax11.net at gmail.com
Tue Apr 30 08:07:13 CDT 2019

On Tue, Apr 30, 2019, 08:50 Carlos E Murillo-Sanchez via cctalk <
cctalk at classiccmp.org> wrote:

> emanuel stiebler via cctalk wrote:
> > On 2019-04-29 13:11, Carlos E Murillo-Sanchez via cctalk wrote:
> >> Dear ccmp'ers:
> >>
> >> For a while now, I noticed that my vaxstation 4000/60 with OpenVMS 7.2
> >> had become sluggish, but I had not had the time to investigate the
> >> problem.   The system is mostly idle, RAM is mostly free (there's 32mb),
> >> there is almost no paging, but the CPU is spending upwards of 70% of the
> >> time in the interrupt stack mode.  Currently, I am running it headless
> >> because I have not had the time to fix the monitor (it still has the
> >> framebuffer inside, but this sluggishness issue was present before with
> >> the monitor attached).  I have read that this can be caused by "faulty
> >> i/o devices that interrupt the cpu continuously".  What else can be done
> >> to locate the source of the problem?
> > SHOW DEV? doesn't show anything weird?
> >
> Interesting... I fired it up to run this command, and now it won't
> finish booting, it gets stuck at the
>       %DECnet-I-LOADED, network base image loaded, version = 05.0D.00
> message...  I do remember running the command and I did not notice any
> strange
> error counts...
> Will try a conversational boot later.  If not, I'll try to restore it
> from tape.

My first guess would have been network problems, and this seems to point
towards that too.

Can you try booting with the network cable unplugged and see if it does
anything different?



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