[PATCH] genirq: Set initial default irq affinity to just CPU0
David Miller
davem at davemloft.net
Sun Oct 26 18:16:56 EST 2008
From: Benjamin Herrenschmidt <benh at kernel.crashing.org>
Date: Sun, 26 Oct 2008 17:48:43 +1100
>
> > What does this all mean to my GigE (dual 1.1 GHz 7455s)? Is this
> > thing supposed to be able to spread irq between its cpus?
>
> Depends on the interrupt controller. I don't know that machine
> but for example the Apple Dual G5's use an MPIC that can spread
> based on an internal HW round robin scheme. This isn't always
> the best idea tho for cache reasons... depends if an at what level
> your caches are shared between CPUs.
it's always going to be the wrong thing to do for networking cards,
especially once we start doing RX flow seperation in software
More information about the Linuxppc-dev
mailing list