netdev - Re: question about softirqs

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Message-Id: <1242120761.11251.324.camel@twins>
Date:	Tue, 12 May 2009 11:32:41 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Chris Friesen <cfriesen@...tel.com>,
	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

On Tue, 2009-05-12 at 11:23 +0200, Ingo Molnar wrote:
> 
> Yeah, that would be "nice". A single IRQ thread plus the process 
> context(s) doing networking might perform well.
> 
> Multiple IRQ threads (softirq and hardirq threads mixed) i'm not so 
> sure about - it's extra context-switching cost.

Sure, that was implied by the getting rid of softirqs ;-), on -rt we
currently suffer this hardirq/softirq thread ping-pong, it sucks.

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