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    SubjectRe: route cache DoS testing and softirqs
    On Tue, 30 Mar 2004 23:14:50 +0200
    Andrea Arcangeli <andrea@suse.de> wrote:

    > > There are no hardirqs in the case under investigation, remember?
    >
    > no hardirqs? there must be tons of hardirqs if ksoftirqd never runs.

    NAPI should be kicking in for this workload, and I know for a fact it is
    for Robert's case. There should only be a few thousand hard irqs per
    second.

    Until the RX ring is depleted the device's hardirqs will not be re-
    enabled.
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