From: Michael Buesch <mb@bu3sch.de>
To: Johannes Berg <johannes@sipsolutions.net>
Subject: Re: zd-mac80211: Fix TX status reports.
Date: Mon, 10 Sep 2007 12:58:39 +0200
Cc: Ulrich Kunitz <kune@deine-taler.de>, Daniel Drake <dsd@gentoo.org>,
	John Linville <linville@tuxdriver.com>,
	linux-wireless@vger.kernel.org
References: <200709082341.31720.mb@bu3sch.de> <200709091259.00237.mb@bu3sch.de> <1189421542.4506.46.camel@johannes.berg>
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On Monday 10 September 2007 12:52:21 Johannes Berg wrote:
> On Sun, 2007-09-09 at 12:58 +0200, Michael Buesch wrote:
> 
> > Basically, the TX status report is only useful for the rate control
> > algorithm. So it's basically "only" statistics. But we have to
> > get these statistics approximately right to get the RC algo working
> > correctly. That is what this patch does. With it, the RC algo properly
> > scales up and down if the signal gets better or worse.
> 
> Michael, this is unfortunately not true. At least hostapd relies on the
> ack callback because it requires stations to acknowledge the association
> response before advancing the state machine, and we have also made
> monitoring outgoing packets depend on the ack callback.

I think the ack callback is pretty reliable, so that should be OK.
It looks for the ACK in software.

-- 
Greetings Michael.