man ksoftirqd indicates that:
If ksoftirqd is taking more than a tiny percentage of CPU time, this indicates the machine is under heavy soft interrupt load.
I'm working with a Debian Wheezy system under generally high system utilization in which ksoftirqd processes utilizes excessive cpu and disk resources for a short period of time. During that time, the system operates at a snails pace.
How can one begin to understand what the root cause is for this ksoftirqd resource utilization spikes?