Re: CONFIG_IRQBALANCE for AMD64?

[Jeff Garzik]

Nivedita Singhvi wrote:
> I see networking interrupts requiring fine granularity
> balancing, to avoid the potential for dropped packets and
> long latencies.  That is, given a busy server that is
> seeing a lot of interrupts, fair distribution of the
> interrupts is required within a very small amount of time,
> and we cannot require a user space daemon that parses the /proc
> file system and applies a policy and then rebinds irqs
> to different CPUs to run with that frequency.


Network is one of the areas where you _don't_ want to be constantly 
pointing your NIC's irq to different CPUs.

Cache affinity, packet re-ordering problems, and other fun ensue.

	Jeff


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