netdev - Re: question about softirqs

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Message-ID: <20090513170122.GZ19296@one.firstfloor.org>
Date:	Wed, 13 May 2009 19:01:22 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Chris Friesen <cfriesen@...tel.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	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

On Wed, May 13, 2009 at 09:05:01AM -0600, Chris Friesen wrote:
> Andi Kleen wrote:
> > Thomas Gleixner <tglx@...utronix.de> writes:
> 
> >>Err, no. Chris is completely correct:
> >>
> >>        if (!in_interrupt())
> >>		wakeup_softirqd();
> > 
> > Yes you have to wake it up just in case, but it doesn't normally
> > process the data because a normal softirq comes in faster. It's
> > just a safety policy. 
> 
> What about the scenario I raised earlier, where we have incoming network
> packets,

network packets are normally processed by the network packet interrupt's
softirq or alternatively in the NAPI poll loop.

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