netdev - Re: question about softirqs

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Message-ID: <20090513141532.GT19296@one.firstfloor.org>
Date:	Wed, 13 May 2009 16:15:32 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Chris Friesen <cfriesen@...tel.com>
Cc:	Andi Kleen <andi@...stfloor.org>, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Thomas Gleixner <tglx@...utronix.de>,
	Steven Rostedt <rostedt@...dmis.org>,
	David Miller <davem@...emloft.net>, linuxppc-dev@...abs.org,
	paulus@...ba.org, netdev@...r.kernel.org
Subject: Re: question about softirqs

> "If a soft irq is raised in process context, raise_softirq() in
> kernel/softirq.c calls wakeup_softirqd() to make sure that ksoftirqd

softirqd is only used when the softirq runs for too long or when
there are no suitable irq exits for a long time.

In normal situations (not excessive time in softirq) they don't
do anything. 

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
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