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SubjectRe: IRQ balancing on a router
On Tuesday 07 October 2008 21:29, Peter Zijlstra wrote:
> 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().

Would be nice to have.

> 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 :-)

Can't you exempt the timer interrupt from counting itself as irq
in the case of timer interrupt based sched_clock()?

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