From: Luciano Coelho <luciano.coelho@nokia.com>
To: ext Johannes Berg <johannes@sipsolutions.net>
Cc: ext Chuck Crisler <ccrisler@vgocom.com>,
"linux-wireless@vger.kernel.org" <linux-wireless@vger.kernel.org>
Subject: Re: active vs. passive scans
Date: Mon, 27 Sep 2010 19:32:58 +0300 [thread overview]
Message-ID: <1285605178.30315.3.camel@powerslave> (raw)
In-Reply-To: <1285600151.4043.23.camel@jlt3.sipsolutions.net>
On Mon, 2010-09-27 at 17:09 +0200, ext Johannes Berg wrote:
> On Mon, 2010-09-27 at 18:06 +0300, Luciano Coelho wrote:
>
> > Usually the drivers stay for a certain period of time in each channel,
> > and that normally doesn't change if you have active or passive scan. So
> > there will be no improvement in the overall scan speed. Of course you
> > could do some tweaks that might improve scanning performance in specific
> > cases.
>
> It's certainly different with mac80211:
>
> #define IEEE80211_CHANNEL_TIME (HZ / 33)
> #define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 8)
Right... Even in the wl1271 driver's hw scan we stay longer on each
channel for passive scans. Obviously just listening to beacons we need
to wait more, because probe_reqs should be responded quickly.
--
Cheers,
Luca.
prev parent reply other threads:[~2010-09-27 16:33 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-27 14:03 active vs. passive scans Chuck Crisler
2010-09-27 15:06 ` Luciano Coelho
2010-09-27 15:09 ` Johannes Berg
2010-09-27 16:32 ` Luciano Coelho [this message]
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