Re: [E1000-devel] CPU load balancing/distribution with 82576 and igb

[Richard C. H. <ri...@mo...>]

Thanks for the reply Mitch. I knew that we had to use irqbalance with  
APIC-based interrupts, but didn't know that held true in the MSI-X  
world as well. Thanks for the info.

-richard

On Mar 10, 2009, at 10:07 AM, Williams, Mitch A wrote:

>> What I'm seeing: All of the interrupts are landing on CPU0 and using
>> up too much time for my liking. I'd like to spread the interrupts
>> around some more, isn't this what having multiple queues is for? The
>> userland irqbalance is disabled for now, as I thought the
>> hardware and
>> driver were supposed to distribute things.
>
> You need to use the irqbalance daemon.  The hardware balances traffic
> across receive queues; the irqbalancer balances queues across CPUs.
>
> Make sure you have a current irqbalancer from http://irqbalance.org.
> The older versions don't handle MSI-X very well.
>
> -Mitch