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From: "Luis R. Rodriguez" <lrodriguez@atheros.com>
Date: Fri, 27 Aug 2010 08:55:25 -0700
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Subject: Re: [RFT] mac80211: fix broadcast/multicast data drop on scan
To: Johannes Berg <johannes@sipsolutions.net>
Cc: Jouni Malinen <j@w1.fi>, linux-wireless@vger.kernel.org,
	Kalle Valo <kvalo@adurom.com>,
	Amod Bodas <Amod.Bodas@atheros.com>
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Sender: linux-wireless-owner@vger.kernel.org

On Fri, Aug 27, 2010 at 8:51 AM, Johannes Berg
<johannes@sipsolutions.net> wrote:
> On Fri, 2010-08-27 at 08:48 -0700, Luis R. Rodriguez wrote:
>
>> > Well, there's no way we can reliably wake up exactly before a beacon by
>> > implementing that in software, hard real-time hasn't been achieved in
>> > Linux yet :-)
>>
>> Keyword here is *exactly*. I don't want to wake up *exactly* at DTIM,
>> only ensure we don't sleep during it and the send buffered frames and
>> multicast traffic data. Why can we not implement this on mac80211?
>
> Well, how long before the beacon do you want to wake up to catch it?
> 1ms? 10ms? 100ms? 1000ms? What if the system is busy?

I cannot say what would work best, how about half a beacon interval early?

  Luis