Re: e1000 softirq load balancing

[Don Porter]

Thanks David.

Would you mind giving me a bit of intuition why I can't have a 1:1 
mapping of CPUs to NICs? 

I am a bit out of my depth here, but I'd like to learn.

Best,
Don

David Miller wrote:
> From: Don Porter <porterde@xxxxxxxxxxxxx>
> Date: Tue, 14 Oct 2008 14:05:34 -0500
>
>   
> > It seems to me that with 4 independent NICs and plenty of CPUs to
> > spare, I ought to be able to assign one softirq daemon to each NIC
> > rather than funnelling all of the traffic through 1 or 2.
> >     
>
> Traffic doesn't get distributed unless the NIC has support
> for RX flow seperation and PCI MSI-X interrupts.  Your NICs
> do not.
>
> So no matter how hard you try, each NIC is going to have it's
> packets processed essentially on one cpu.
>   

--
To unsubscribe from this list: send the line "unsubscribe linux-net" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html