From owner-freebsd-wireless@FreeBSD.ORG Thu Aug 23 01:17:29 2012 Return-Path: Delivered-To: freebsd-wireless@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 115CC106566C; Thu, 23 Aug 2012 01:17:29 +0000 (UTC) (envelope-from prvs=575f86cc2=Brett.Wright@cooperindustries.com) Received: from cooperlighting-sw.cooperlighting.com (cooperlighting-sw.cooperlighting.com [216.130.131.68]) by mx1.freebsd.org (Postfix) with ESMTP id AD53C8FC12; Thu, 23 Aug 2012 01:17:28 +0000 (UTC) Authentication-Results: cooperlighting-sw.cooperlighting.com; dkim=neutral (message not signed) header.i=none X-IronPort-AV: E=Sophos;i="4.80,297,1344225600"; d="scan'208";a="66300760" Received: from cipt0175.nam.ci.root ([10.132.108.175]) by cooperlighting-sw.cooperlighting.com with ESMTP; 22 Aug 2012 21:17:28 -0400 Received: from APEVS1.AP.CI.ROOT ([10.180.2.22]) by cipt0175.NAM.CI.ROOT with Microsoft SMTPSVC(6.0.3790.4675); Wed, 22 Aug 2012 21:17:27 -0400 X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Date: Thu, 23 Aug 2012 09:16:34 +0800 Message-ID: <475A4E02EFF4724A9E58F55A56AC13160661F182@APEVS1.ap.ci.root> In-Reply-To: X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: Atheros DFS radar detection Thread-Index: Ac2AyBlhhvFHY98JQY2NEULZzot66AAA+New References: <475A4E02EFF4724A9E58F55A56AC13160641D618@APEVS1.ap.ci.root><475A4E02EFF4724A9E58F55A56AC13160661E6AC@APEVS1.ap.ci.root> From: "Wright, Brett" To: "Adrian Chadd" X-OriginalArrivalTime: 23 Aug 2012 01:17:27.0959 (UTC) FILETIME=[0F750270:01CD80CD] Cc: freebsd-wireless@freebsd.org, Kim Culhan Subject: RE: Atheros DFS radar detection X-BeenThere: freebsd-wireless@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: "Discussions of 802.11 stack, tools device driver development." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 23 Aug 2012 01:17:29 -0000 Hi Adrian, > -----Original Message----- > From: adrian.chadd@gmail.com [mailto:adrian.chadd@gmail.com] On Behalf > Of Adrian Chadd >=20 > hi, >=20 > would you mind filing a couple of PRs, just so I remember to get this > stuff done: >=20 Sure. > I've whacked an AR5212 reference cardbus NIC into a laptop and added > the AR5212 parameters to dfs_null.c. I get around 40 false detects a > second when doing around 25mbit/sec TCP iperf test. That seems to be about the rate of false detects I now get without setting the parameters too aggressively... However, even with that rate of false detects and iperfing continuously, I inevitably get a radar pattern match and channel change (usually within about 20 minutes of continuous iperf). With the more aggressive parameters it is much better - but am suspicious that then real radar pulse matching will fail. Perhaps false detects causing the radar pattern to be triggered and channel change is just going to be inevitable to some degree? >=20 > Adrian