MSI-X and interrupt affinity with Emulex be2net

Hi all,

I am using a be2net ethernet interface, and am on the master git
repository, so the latest kernel available.
I have MSI-X enabled of course, and as far as I can tell, all
interrupts are bound to CPU0.
I have several process and threads which use quite all the ethernet
interfaces I have, and I reach 7180 IRQs/sec on CPU0.

I have several questions regarding this :
- I thought MSI-X would help in balancing IRQs on different CPUs
- Is this a good idea anyway to specify which IRQ is bound to which
CPU manually, if I set the process using the IRQ to the same CPU ?
- How can I measure performance impact (using perf, probably) of no
balancing (ie, all on CPU0) versus balancing like explained above ?

Thanks for your advice !
JM