From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from smtp.rutgers.edu ([128.6.72.243]:38116 "EHLO annwn14.rutgers.edu" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S932470AbXCVXTd (ORCPT ); Thu, 22 Mar 2007 19:19:33 -0400 From: Michael Wu To: Johannes Berg Subject: Re: [PATCH 0/4] Try #5: Radiotap on Monitor Mode interfaces for rx and tx Date: Thu, 22 Mar 2007 19:10:30 -0400 Cc: andy@warmcat.com, linux-wireless@vger.kernel.org References: <20070320103955.600509703@warmcat.com> <1174502809.3944.36.camel@johannes.berg> In-Reply-To: <1174502809.3944.36.camel@johannes.berg> MIME-Version: 1.0 Content-Type: multipart/signed; boundary="nextPart3681876.jLAWxxaL6S"; protocol="application/pgp-signature"; micalg=pgp-sha1 Message-Id: <200703221910.36705.flamingice@sourmilk.net> Sender: linux-wireless-owner@vger.kernel.org List-ID: --nextPart3681876.jLAWxxaL6S Content-Type: text/plain; charset="iso-8859-15" Content-Transfer-Encoding: 7bit Content-Disposition: inline On Wednesday 21 March 2007 14:46, Johannes Berg wrote: > If the driver does not support radiotap, ieee80211_rx_monitor needs to > expand the head for each packet. Currently, this is also true, but since > currently no non-management frames are sent down the management > interface, this is not an issue. If each data packet needs to be first > reallocated though, it quickly becomes a problem for low-power embedded > access points running hostapd. > That's why drivers should be modified to support radiotap. > Additionally, the overhead of tacking on radiotap headers to each > received frame is also rather high if you're only interested in > receiving the information for management frames. > It's really not that much overhead. -Michael Wu --nextPart3681876.jLAWxxaL6S Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.5 (GNU/Linux) iD8DBQBGAwzsT3Oqt9AH4aERAs+cAKDDtlTknHbkwciWZMtG552pcoSsFwCdEtcu 7W2kGiGTJ2oAUsR5FR/PNlc= =kIL3 -----END PGP SIGNATURE----- --nextPart3681876.jLAWxxaL6S-- -: To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@vger.kernel.org: More majordomo info at http: //vger.kernel.org/majordomo-info.html