netdev - Re: [linux-pm] [RFC] Runtime power management on ipw2100

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Message-ID: <20070131130447.GF19643@elf.ucw.cz>
Date:	Wed, 31 Jan 2007 14:04:47 +0100
From:	Pavel Machek <pavel@...e.cz>
To:	Amit Kucheria <amit.kucheria@...ia.com>
Cc:	ext Andi Kleen <ak@...e.de>, Matthew Garrett <mjg59@...f.ucam.org>,
	netdev@...r.kernel.org, linux-pm@...ts.osdl.org,
	ipw2100-devel@...ts.sourceforge.net
Subject: Re: [linux-pm] [RFC] Runtime power management on	ipw2100

On Wed 2007-01-31 13:53:20, Amit Kucheria wrote:
> On Wed, 2007-01-31 at 11:48 +0100, ext Andi Kleen wrote:
> > On Wednesday 31 January 2007 11:27, Matthew Garrett wrote:
> > > On Wed, Jan 31, 2007 at 12:13:04PM +0100, Andi Kleen wrote:
> > > > Matthew Garrett <mjg59@...f.ucam.org> writes:
> > > > > 
> > > > > PCI seems to require a delay of 10ms when sequencing from D3 to D0, 
> > > > > which probably isn't acceptable latency for an "up" state.
> > > > 
> > > > It might be if the interface has been idle for some time
> > > > (and the delay is not busy looping of course)
> > > 
> > > Hm. How would this interact with receiving packets?
> > 
> > The hardware will hopefully have support to wake itself up when that 
> > happens.
> 
> Yes. Low power states without ability to respond to wakeup interrupts
> would be broken behaviour generally.

Do you realy expect wifi to save significant ammount of power, while
still listening for packets on wireless network?
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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