Excessive amount of time in interrupt stack mode

Jon Elson elson at pico-systems.com
Mon Apr 29 12:47:01 CDT 2019

On 04/29/2019 12:11 PM, Carlos E Murillo-Sanchez via cctalk 
> 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?
Check for disk fragmentation?


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