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From: Helmut Schaa <helmut.schaa@googlemail.com>
To: Kalle Valo <kalle.valo@iki.fi>
Subject: Re: ath9k becon loss messages
Date: Mon, 6 Apr 2009 10:56:27 +0200
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Cc: Jaswinder Singh Rajput <jaswinder@kernel.org>,
       Michael Buesch <mb@bu3sch.de>, Sujith <Sujith.Manoharan@atheros.com>,
       wireless <linux-wireless@vger.kernel.org>,
       David Miller <davem@davemloft.net>, LKML <linux-kernel@vger.kernel.org>
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Am Montag, 6. April 2009 schrieb Kalle Valo:
> Helmut Schaa <helmut.schaa@googlemail.com> writes:
> 
> >> Then there is something happening in ath9k or your AP which prevents
> >> ath9k from receiving beacons. Try pinging your AP with 100 ms
> >> interval. Do you see anything happening in 120 s intervals?
> >
> > NetworkManager typically scans every 120 seconds and I can also trigger
> > the messages by a manual scan with iwlist. I did not dig any further but
> > the messages seem to appear right at the end of the scan. Tried with iwlagn
> > and both sw_scan and hw_scan.
> 
> Thanks, this was valuable info. It might be that my beacon filtering
> patches broke something related to scanning and beacon loss check. I'll
> take a look at this.

Maybe you did not break anything. During a scan we will stay away from the
operating channel for some seconds which indeed prevents us from receiving
beacons. I'd say sending a probe request to the AP in that case won't hurt.

Helmut