From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail.kapsi.fi ([217.30.184.167]:46984 "EHLO mail.kapsi.fi" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751916AbZIJPzS (ORCPT ); Thu, 10 Sep 2009 11:55:18 -0400 Message-ID: <4AA92160.5080200@iki.fi> Date: Thu, 10 Sep 2009 18:55:12 +0300 From: Antti Palosaari MIME-Version: 1.0 To: Devin Heitmueller CC: "Aleksandr V. Piskunov" , Markus Rechberger , Clinton Meyer , Linux Media Subject: Re: LinuxTV firmware blocks all wireless connections / traffic References: <62013cda0909091443g72ebdf1bge3994b545a86c854@mail.gmail.com> <829197380909091459x5367e95dnbd15f23e8377cf33@mail.gmail.com> <20090910091400.GA15105@moon> <20090910124549.GA18426@moon> <20090910124807.GB18426@moon> <4AA8FB2F.2040504@iki.fi> <20090910134139.GA20149@moon> <4AA9038B.8090404@iki.fi> <4AA911B6.2040301@iki.fi> <829197380909100826i3e2f8315yd6a0258f38a6c7b9@mail.gmail.com> In-Reply-To: <829197380909100826i3e2f8315yd6a0258f38a6c7b9@mail.gmail.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-media-owner@vger.kernel.org List-ID: Devin Heitmueller wrote: > The URB size is something that varies on a device-by-device basis, > depending on the bridge chipset. There really is no > "one-size-fits-all" value you can assume. I doubt no. I tested last week rather many USB chips and all I tested allowed to set it as x188 or x512 bytes. If it is set something than chip does not like it will give errors or packets that are not as large as requested. You can test that easily, look dvb-usb module debug uxfer and use powertop. > I usually take a look at a USB trace of the device under Windows, and > then use the same value. I have seen logs where different sizes of urbs used even same chip. regards Antti -- http://palosaari.fi/