Subject: Re: ar9170 in AP mode
From: Johannes Berg <johannes@sipsolutions.net>
To: Jan Kiszka <jan.kiszka@web.de>
Cc: Kalle Valo <kalle.valo@iki.fi>, linux-wireless@vger.kernel.org
In-Reply-To: <4AF6CC02.8080204@web.de>
References: <4AF6C7CD.7060108@web.de> <878wehf85v.fsf@purkki.valot.fi>
	 <4AF6CC02.8080204@web.de>
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Date: Sun, 08 Nov 2009 15:01:10 +0100
Message-ID: <1257688870.29454.52.camel@johannes.local>
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On Sun, 2009-11-08 at 14:47 +0100, Jan Kiszka wrote:

> > IMHO AP mode should not be enabled until it's confirmed that power
> > save mode works properly.

Agreed.

> How common is the combination of powersaving and mcast in practice?

Uh, it's nothing to do with the combination. If you don't support proper
mcast buffering, any powersaving client will be in big trouble due to
ARP/NDP etc.

Any device that supports powersaving is thus impacted. That ranges from
desktops and laptops down to your cellphone.

> Given that quite a few useful scenarios are blocked right now (unless
> you know what to patch), I would at least vote for a config option or a
> module parameter. That gives a chance to warn the user about this
> limitation without locking out people that are no hackers.

Given that we want to have everything support powersave on the client
side, I have to disagree -- supporting something that will be
troublesome for many clients will just make it look bad.

johannes

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