With no other major CPU usage, but CPU 0 pegged, "perf top" shows this as the top usage:
50.02% [kernel] [k] tasklet_action 23.48% [kernel] [k] __do_softirq 5.66% [kernel] [k] __raise_softirq_irqoff
With no other major CPU usage, but CPU 0 pegged, "perf top" shows this as the top usage:
50.02% [kernel] [k] tasklet_action softirq_ irqoff
23.48% [kernel] [k] __do_softirq
5.66% [kernel] [k] __raise_