Re: e1000 softirq load balancing

[Aaron Porter]

On Tue, Oct 14, 2008 at 12:05 PM, Don Porter <porterde@xxxxxxxxxxxxx> wrote:
> What I am observing is that a single ksoftirqd thread is becoming a
> bottleneck for the system.
> More specifically, one cpu runs ksoftirqd at 100% cpu utilization, while 4
> cpus each run their servers at about 25%.  I carefully used
> sched_setaffinity() to map server threads to cpus and
> /proc/irq/<device>/smp_affinity to map hardware interrupts to cpus such that
> there should be exactly 1 cpu per server thread and 1 cpu for servicing
> hardware interrupts per device.

Could you provide some more detail about the smp_affinity mask you're
setting? I can push a pretty constant 5.9gbps out of a 6gb bond device
(2 x forcedeth, 4 x e1000) using the 1 IRQ/CPU method.
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