Sorry. that i interfere in this subject.

Do you recommend CONFIG_IRQBALANCE to be enabled?

If it is enabled - irq's not jumping nonstop over processors. softirqd 
changing this behavior.
If it is disabled, irq's distributed over each processor, and in loaded 
systems it seems harmful. 
I work a little yesterday with server with CONFIG_IRQBALANCE=no, 160kpps load.
It was packetloss-ing, till i set smp_affinity.

Maybe it is useful to put more info in Kconfig, since it is very important 
for performance option.

On Fri, 11 Jan 2008 17:41:09 -0800 (PST), David Miller wrote

From: Benny Amorsen <benny usenet@amorsen.dk>
Date: Fri, 11 Jan 2008 12:09:32  0100

quoted

David Miller [off-list ref] writes:

quoted

No IRQ balancing should be done at all for networking device
interrupts, with zero exceptions.  It destroys performance.

Does irqbalanced need to be taught about this?

The userland one already does.

It's only the in-kernel IRQ load balancing for these (presumably
powerpc) platforms that is broken.
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