Return-path: Received: from xc.sipsolutions.net ([83.246.72.84]:48333 "EHLO sipsolutions.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753073AbZHLHOR (ORCPT ); Wed, 12 Aug 2009 03:14:17 -0400 Subject: Re: Roaming behavior From: Johannes Berg To: Holger Schurig Cc: David Seira , linux-wireless@vger.kernel.org In-Reply-To: <200908120907.18501.hs4233@mail.mn-solutions.de> References: <20090811135915.GC2684@tuxdriver.com> <1250003481.4185.7.camel@solid2> <200908120907.18501.hs4233@mail.mn-solutions.de> Content-Type: multipart/signed; micalg="pgp-sha1"; protocol="application/pgp-signature"; boundary="=-dDrrI9sC8kLtX8d5m3Mi" Date: Wed, 12 Aug 2009 09:14:08 +0200 Message-Id: <1250061248.13529.94.camel@johannes.local> Mime-Version: 1.0 Sender: linux-wireless-owner@vger.kernel.org List-ID: --=-dDrrI9sC8kLtX8d5m3Mi Content-Type: text/plain Content-Transfer-Encoding: quoted-printable On Wed, 2009-08-12 at 09:07 +0200, Holger Schurig wrote: > Some examples: with madwifi, I can tell the driver to only scan=20 > on channels 1,6,11. That's not exactly standards-conforming, but=20 > can speed up roaming considerably, because a full scan is now=20 > way shorter. mac80211 doesn't support such a thing directly. It=20 > just occurs to me that you might be able to do something like=20 > with with a special regulatory daemon. Or you can just ask wpa_supplicant to do that with -Dnl80211. > Or with orinoco, you could define a level when to roam (e.g. at=20 > what SNR/RSSI/whatever it is based on). mac80211 doesn't have=20 > this. The intention is to add signal strength triggers to mac80211/drivers to notify wpa_supplicant which then implements the algorithm. There are a ton of algorithms to choose from, so this will be very good for experimentation, academia and getting the best algorithm eventually :) Right now you don't have signal strength triggers so you'd have to monitor the signal strength (like "iw wlan0 link"). johannes --=-dDrrI9sC8kLtX8d5m3Mi Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part -----BEGIN PGP SIGNATURE----- iQIcBAABAgAGBQJKgmu8AAoJEODzc/N7+QmafWIQAJ2/BHplrJ1bWmCYgvJIG2oV HGs+EmgBRlMSq8VJA3XKA3kavxQabLGqxHJYPjPmOtrU3zvTtRKVXBHop4UgXSxz PPY/yeqpzZl+ZKlDQah+5aC7xf9cfGNk8fWrzupIBKbE3MBrtjkEcrhdR9WujX5i oHXIcgNjLJXhzw7KJQGPJPd9nTJrC77BNr9AovUzVxx9/VxMQ8lmCiacgooBGvSL E6DtbZxFAga1hh1wodS8SVr6Q2YG/dWk11smhnyQYQd3610+tr6kCz/J+R9Pzskr 0+KhJvpyHyiTPe55u3sWI3BV1robVQNUWnmBW0/fvKAIsvkMMaDlDLfdgrnFa5e1 ayLG6sHMzKWylTpu1/FqyDyHy5di6+2XtY93zRbIFiUSrrqQ8TG8sReIHAZVhOGE gTorRwPwliFuwf9zgWVXjiDPJfy657jW6OQkDMlvyP7auaCnoNscH0bhYEb6u0Bo Fl7ilj0CmdE9wQ+J7OUqDD6Ype0z6vXKnSPz+2TJMd3m3Ks+WQnxn1K3MskNsZvO o6OC9Y4EqT6YLiCwdlY0YvIwGPRwMuGbrevydFGuI5wB3pzvATZoyhMQUfeqATLR eW4xeyuDjHwjzsEE1CjqhdBv44CUep8VKfP+FL2FXfDFLFo0OCzUyCrlINbyBubV imHzwzHJ2TRRp9Dbw9XK =hEPd -----END PGP SIGNATURE----- --=-dDrrI9sC8kLtX8d5m3Mi--