Re: [PATCH] genirq: Set initial default irq affinity to just CPU0
From: David Miller <davem@davemloft.net>
Date: 2008-10-26 07:17:20
From: Benjamin Herrenschmidt <benh@kernel.crashing.org> Date: Sun, 26 Oct 2008 17:48:43 +1100
quoted
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