From owner-freebsd-wireless@FreeBSD.ORG Fri Sep 9 16:12:55 2011 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 DB187106566C; Fri, 9 Sep 2011 16:12:55 +0000 (UTC) (envelope-from lev@serebryakov.spb.ru) Received: from onlyone.friendlyhosting.spb.ru (onlyone.friendlyhosting.spb.ru [IPv6:2a01:4f8:131:60a2::2]) by mx1.freebsd.org (Postfix) with ESMTP id 8E0208FC16; Fri, 9 Sep 2011 16:12:55 +0000 (UTC) Received: from lion.home.serebryakov.spb.ru (unknown [IPv6:2001:470:923f:1:14f9:cfdf:caf2:2c18]) (Authenticated sender: lev@serebryakov.spb.ru) by onlyone.friendlyhosting.spb.ru (Postfix) with ESMTPA id D54DC4AC31; Fri, 9 Sep 2011 20:12:53 +0400 (MSD) Date: Fri, 9 Sep 2011 20:12:49 +0400 From: Lev Serebryakov X-Priority: 3 (Normal) Message-ID: <1181080993.20110909201249@serebryakov.spb.ru> To: Adrian Chadd In-Reply-To: References: <663133681.20110907193747@serebryakov.spb.ru> <437702009.20110907235248@serebryakov.spb.ru> <426917282.20110908125907@serebryakov.spb.ru> <4610390305.20110908154130@serebryakov.spb.ru> <1705262661.20110908180850@serebryakov.spb.ru> <458771414.20110908183656@serebryakov.spb.ru> <4910491962.20110908185213@serebryakov.spb.ru> <1273865639.20110908191303@serebryakov.spb.ru> <1607911768.20110909113824@serebryakov.spb.ru> <140679489.20110909154614@serebryakov.spb.ru> <192542574.20110909193326@serebryakov.spb.ru> MIME-Version: 1.0 Content-Type: text/plain; charset=windows-1251 Content-Transfer-Encoding: quoted-printable Cc: freebsd-wireless@freebsd.org Subject: Re: AP performance (again): txpower regulation 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: Fri, 09 Sep 2011 16:12:55 -0000 Hello, Adrian. You wrote 9 =F1=E5=ED=F2=FF=E1=F0=FF 2011 =E3., 19:37:57: > Look at all of those OFDM errors. That's a big, big part of your problem. Yep. I've been almost sure, that this is not normal to see such big numbers here. > It's possible that there's some problem with the driver code and it's > somehow setting up the RX side of your NIC incorrectly, causing lots > of those OFDM errors. > But it's also very likely you've just got a lot of noise in your local > environment. Interesting question, is it possible to measure noise without spending $100K on special hardware? And, is it possible, that cause of these errors is that card is broken? Overheated some time ago, for example -- case of my AP is not very well ventilated, unfortunately, it is Soekris net5501 in its standard case and it is very hot sometimes. > You could try disabling ANI (sysctl dev.ath.0.intmit=3D0) and see if > things behave better/worse. You won't get OFDM/CCK error counts > though, so don't assume "0" for those counts magically means they went > away. Stable 36M from athstat and 9-10Mbit UDP from client to server. Changing this sysctl back and forth doesn't affect bandwidth. BTW, it seems, that problems is (partially) with noise in environment -- speed vary from day to day... > Finally, if you/someone sends me one of those NICs, I can try using it > here and see how it behaves. :) It seems, they are discounted :( I could not find any in-stock. --=20 // Black Lion AKA Lev Serebryakov