From owner-freebsd-wireless@FreeBSD.ORG Thu Apr 14 09:59:38 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 91F5A1065670 for ; Thu, 14 Apr 2011 09:59:38 +0000 (UTC) (envelope-from cowbert@gmail.com) Received: from mail-vw0-f54.google.com (mail-vw0-f54.google.com [209.85.212.54]) by mx1.freebsd.org (Postfix) with ESMTP id 475818FC0C for ; Thu, 14 Apr 2011 09:59:37 +0000 (UTC) Received: by vws18 with SMTP id 18so1478413vws.13 for ; Thu, 14 Apr 2011 02:59:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:date:message-id:subject:from:to :content-type; bh=x5avA4LM+sk7Xbz9sWPRo7aNNPWLyrM+j9z4NDck344=; b=lKR9nw6Ee+4ykkqb2KJdjd6vnA4Ti5ylx6vhs+IwteIfA9sCMQfR3Wjb7m+dnJVDoS Kb8C8dNEHVNYwy1dOg33njnOjh9HQxSNB2enucap6YTozyw0MpcvjAZ0mohTbbb5aTq/ Mcxvy1VWa36KEFB0M1KRgLClzdE/DWt+whPow= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:date:message-id:subject:from:to:content-type; b=iPQ//XVg3nFmzD2+unHMGCt1E5mfWMg4rR13qI9IfAHNJmTwXAxlTMsalwb9Hx3ZfL eEy5sUPvlyGwmmBcIsZaHQn2UTZz69KmfYaXhlTUcOKR2Y2rdyDPsNq5pECCvcuXwMes zhO4xUJox6VIHUyztRuVdsW5+bPM0dCjZwQYI= MIME-Version: 1.0 Received: by 10.52.0.229 with SMTP id 5mr713233vdh.271.1302773724856; Thu, 14 Apr 2011 02:35:24 -0700 (PDT) Received: by 10.52.158.168 with HTTP; Thu, 14 Apr 2011 02:35:24 -0700 (PDT) Date: Thu, 14 Apr 2011 05:35:24 -0400 Message-ID: From: Peter Lai To: freebsd-wireless@freebsd.org Content-Type: text/plain; charset=UTF-8 Subject: uplink bandwidth < 1/3 downlink bandwidth? 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, 14 Apr 2011 09:59:38 -0000 This is probably more of a layer1/2/management issue, but someone in IRC told me to ask the mailinglist about it so here it goes: On a client running AR2413 hardware, the uplink bandwith appears to be very bad compared to the downlink. The downlink I can get almost theoretical-real speed, 19Mbps/1.9Mib/s from an Aruba centralized wifi net with WPA2, but uplink to the same AP runs at barely 3Mbps/300Kib/s. I have a passive 9dbi duck antenna connected to my pci card and I get s/n of 82/96 according to ifconfig wlan0 list scan and I have set the transmitter to txpower 30 and ifconfig reports OFDM capable at 54Mbps. Again, I can pull downlink pretty fast, and even when I'm pulling this traffic I am pretty lag free (simultaneous ping from the client to the aggregation router only increases by 50ms at most), but when I upload my ping goes through the roof (up to 3000ms) and it looks like my uplink bandwidth is overutilized. The speeds are measured by dd at the client. Any 802.11 gurus know what might be up with this? I'm pretty sure it's not FreeBSD specific but maybe I can still be pointed in a direction (maybe it's a traffic shaping policy on the AP or something).