From: Nick Piggin <nickpiggin@yahoo.com.au>
To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arjan van de Ven <arjan@linux.intel.com>,
Jan Kasprzak <kas@fi.muni.cz>,
linux-kernel@vger.kernel.org
Subject: Re: IRQ balancing on a router
Date: Wed, 8 Oct 2008 02:00:04 +1100 [thread overview]
Message-ID: <200810080200.05107.nickpiggin@yahoo.com.au> (raw)
In-Reply-To: <1223375380.26330.24.camel@lappy.programming.kicks-ass.net>
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()?
prev parent reply other threads:[~2008-10-07 15:00 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-03 13:21 IRQ balancing on a router Jan Kasprzak
2008-10-03 13:38 ` Arjan van de Ven
2008-10-03 14:29 ` Jason Baron
2008-10-03 15:05 ` Arjan van de Ven
2008-10-03 14:57 ` Jan Kasprzak
2008-10-03 15:22 ` Arjan van de Ven
2008-10-07 10:29 ` Peter Zijlstra
2008-10-07 15:00 ` Nick Piggin [this message]
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