netdev - Re: question about softirqs

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Message-ID: <20090513150242.GX19296@one.firstfloor.org>
Date:	Wed, 13 May 2009 17:02:42 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Eric Dumazet <dada1@...mosbay.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Chris Friesen <cfriesen@...tel.com>,
	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

> I have one machine SMP flooded by network frames, CPU0 handling all

Yes that's the case softirqd is supposed to handle. When you 
spend a significant part of your CPU time in softirq context it kicks
in to provide somewhat fair additional CPU time.

But most systems (like mine) don't do that.

-Andi

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