Excessive amount of time in interrupt stack mode

[emanuel stiebler]

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?