Re: IRQ balancing on a router

[Peter Zijlstra]

On Fri, 2008-10-03 at 06:38 -0700, Arjan van de Ven wrote:

> The good news is that irqthreads at least have the potential to solve
> this "lack of information"; if not, we could consider doing a form of
> microaccounting for irq handlers....

I have some patches floating about that account for nmi/irq/softirq time
in a fine grained scale. The trouble is that i've so far not found a way
to handle the case of a jiffie based sched_clock().

The trouble with that is that time always increases in IRQ context, so
nmi=0, softirq=0, regular=0 but irq=100%, which is obviuosly
sub-optimal :-)

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