Hi.
Full interrupt rate on some CPU means that your system is not idle, but
running some process. Another possibility is that you have DUMMYNET
compiled into your kernel, which tends to schedule callout for every HZ
tick, effectively blocking skipping interrupts for one of CPUs.
Check 'top -SH' for running processes, or 'top -SH -m io -o vcsw' for
processes doing a lot of context switches. That most likely should give
an answer.
--
Alexander Motin
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