From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Arjan van de Ven <arjan@linux.intel.com>
Cc: Jan Kasprzak <kas@fi.muni.cz>, linux-kernel@vger.kernel.org
Subject: Re: IRQ balancing on a router
Date: Tue, 07 Oct 2008 12:29:39 +0200 [thread overview]
Message-ID: <1223375380.26330.24.camel@lappy.programming.kicks-ass.net> (raw)
In-Reply-To: <20081003063857.76b7b61a@linux.intel.com>
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 :-)
next prev parent reply other threads:[~2008-10-07 10:30 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 [this message]
2008-10-07 15:00 ` Nick Piggin
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