Excessive amount of time in interrupt stack mode

John Klos john at ziaspace.com
Tue Apr 30 13:02:24 CDT 2019

> 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.

If I had to guess, I'd say the most likely culprit is ethernet. Try 
disconnecting ethernet, perhaps the AUI, too, and see if it's any 


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