linux-kernel - Re: [PATCH 09/12] irq: implement IRQ expecting

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Date:	Sat, 19 Jun 2010 11:00:31 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Tejun Heo <tj@...nel.org>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Arjan van de Ven <arjan@...radead.org>, mingo@...e.hu,
	tglx@...utronix.de, bphilips@...e.de, yinghai@...nel.org,
	akpm@...ux-foundation.org, torvalds@...ux-foundation.org,
	linux-kernel@...r.kernel.org, jeff@...zik.org,
	linux-ide@...r.kernel.org, stern@...land.harvard.edu,
	gregkh@...e.de, khali@...ux-fr.org
Subject: Re: [PATCH 09/12] irq: implement IRQ expecting

> IIUC, it's not to help or optimize polling itself.  It just gives us a
> way to estimate when the next interrupt would be so that power can be
> optimized for non polling cases.

Shouldn't the idle governour estimate this already?

BTW I looked at something like this for networking. There was
one case where a network benchmark was impacted by deep sleep
states while processing packets. But in the end it turned
out to be mostly a broken BIOS that gave wrong
parameters to the idle governour.

-Andi

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