--Jeff Garzik <jgarzik@xxxxxxxxx> wrote (on Saturday, February 19, 2005 11:30:53 -0500):
Pallipadi, Venkatesh wrote:
You are right. Kernel balancer doesn't move around the irqs, unless it
has too many interrupts. The logic is moving around interrupts all the
time will not be good on caches. So, there is a threshold above which
the balancer start moving things around.
You should see them moving around if you do 'ping -f' or a big 'dd' from
the disk.
If kirqd is moving NIC interrupts, it's broken.
(and another reason why irqbalanced is preferable)
Why is it broken to move NIC interrupts? Obviously you don't want to
rotate them around a lot, but in the interests of fairness to other processes, it seems reasonable to migrate them occasionally (IIRC, kirqd
rate limits to once a second or something).