Subject: Re: route cache DoS testing and softirqs

From: "David S. Miller" <[email-masked]>
Date: Tue, 30 Mar 2004 13:30:00 -0800

On Tue, 30 Mar 2004 23:14:50 +0200
Andrea Arcangeli <[email-masked]> 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.