On Wednesday 12 January 2005 04:02 pm, Robert Olsson wrote:
> Jeremy M. Guthrie writes:
> > My throughput dropped from 500 mbps to 8mbps. 8(
>
> Weird!
>
> > CPU0 CPU1
> > 18: 3586173518 1815 IO-APIC-level eth3
> > 20: 2 2464382507 IO-APIC-level eth2
> >
> > CPU0 CPU1
> > 18: 3586173518 1815 IO-APIC-level eth3
> > 20: 2 2464387985 IO-APIC-level eth2
>
> There are no irq's on eth3 at all so RX softirq is constantly running.
> Which means it's deferred to ksoftirqd now and running under scheduler
> context. Do you have anything that competes with ksoftirqd for CPU0 on
> your system?
This box is primarily routing. Nothing should be competing for CPU0
> It used be recommended to increase the priority of ksoftirqd but I wonder
> what's going on your system. We see interrupts on eth2...
>
> And tsquz (3:rd col) in /proc/net/sofnet_stat indicates there are very
> little activity from the RX softirq. It's soon time time up here.
>
>
> --ro
--
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Jeremy M. Guthrie jeremy.guthrie@xxxxxxxxxx
Senior Network Engineer Phone: 608-298-1061
Berbee Fax: 608-288-3007
5520 Research Park Drive NOC: 608-298-1102
Madison, WI 53711
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