linux-kernel - Re: [patch 4/4] genirq: add support for threaded interrupt handlers

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Message-ID: <20090227070633.2c3fc04e@infradead.org>
Date:	Fri, 27 Feb 2009 07:06:33 -0800
From:	Arjan van de Ven <arjan@...radead.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org, mingo@...e.hu, rostedt@...dmis.org,
	jonathan@...masters.org
Subject: Re: [patch 4/4] genirq: add support for threaded interrupt handlers

On Fri, 27 Feb 2009 09:05:10 +0100
Peter Zijlstra <peterz@...radead.org> wrote:

> 
> Right, Thomas did the EHCI usb driver, the network driver you propose
> is a tad hard since it relies on the whole network stack softirq
> stuff. Re-working the whole net-stack to make use of threaded
> handlers is a massive undertaking -- although I seem to remember
> someone doing it a few years back and seeing a general performance
> improvement, Thomas still got a link to that work?


we shouldn't have to; just running the softirq handler from the irq
thread should work, and not lose real performance.
Sure you're not going to get a performance gain that you could get
but it still works.
or am I missing something?

(and esp for things like wireless drivers, that should be just fine; I
can understand hesitation to do 10g ethernet drivers right away ;-)


-- 
Arjan van de Ven 	Intel Open Source Technology Centre
For development, discussion and tips for power savings, 
visit http://www.lesswatts.org
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