From: Johannes Berg <johannes@sipsolutions.net>
To: Helmut Schaa <helmut.schaa@googlemail.com>
Cc: linux-wireless@vger.kernel.org
Subject: Re: hostapd & mac80211: too many probe responses
Date: Fri, 01 Apr 2011 12:46:42 +0200 [thread overview]
Message-ID: <1301654802.3832.17.camel@jlt3.sipsolutions.net> (raw)
In-Reply-To: <201104011237.21983.helmut.schaa@googlemail.com>
On Fri, 2011-04-01 at 12:37 +0200, Helmut Schaa wrote:
> I've just noticed that hostapd + mac80211 + rt2x00 produces way too many
> probe responses when setup as multi bssid AP.
>
> The reason seems to be that mac80211 receives a broadcast probe req and
> drops it to the monitor interface for each vif (hence X times). And hostapd
> will process each received broadcast probe req on all vifs as well (hence X
> times again). Resulting in X*X probe responses instead of just X.
>
> This can eat up quite some airtime as the probe reponses are sent at 1Mpbs.
>
> IMO to fix this issue mac80211 should send a broadcast probe req only once
> to the monitor interface. However, I don't have a good idea how to do that
> right now :)
Looks like we broke that then, IEEE80211_RX_CMNTR was intended to do
this.
johannes
next prev parent reply other threads:[~2011-04-01 10:44 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-01 10:37 hostapd & mac80211: too many probe responses Helmut Schaa
2011-04-01 10:46 ` Johannes Berg [this message]
2011-04-01 10:55 ` Helmut Schaa
2011-04-01 11:00 ` Johannes Berg
2011-04-01 11:39 ` Helmut Schaa
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