linux-kernel - Re: IRQ balancing on a router

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Message-Id: <1223375380.26330.24.camel@lappy.programming.kicks-ass.net>
Date:	Tue, 07 Oct 2008 12:29:39 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Arjan van de Ven <arjan@...ux.intel.com>
Cc:	Jan Kasprzak <kas@...muni.cz>, linux-kernel@...r.kernel.org
Subject: Re: IRQ balancing on a router

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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