From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from relay02.cambriumhosting.nl ([217.19.16.174]:56102 "EHLO relay02.cambriumhosting.nl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754171AbZGVKKl (ORCPT ); Wed, 22 Jul 2009 06:10:41 -0400 Received: from relay02.cambriumhosting.nl (localhost [127.0.0.1]) by relay02.cambriumhosting.nl (Postfix) with ESMTP id 87CE460001C0 for ; Wed, 22 Jul 2009 12:10:39 +0200 (CEST) Received: from ashley.powercraft.nl (84-245-3-195.dsl.cambrium.nl [84.245.3.195]) by relay02.cambriumhosting.nl (Postfix) with ESMTP id 7531060001BA for ; Wed, 22 Jul 2009 12:10:39 +0200 (CEST) Received: from [192.168.1.239] (unknown [192.168.1.239]) by ashley.powercraft.nl (Postfix) with ESMTPSA id 3279A23BC5E1 for ; Wed, 22 Jul 2009 12:10:39 +0200 (CEST) Message-ID: <4A66E59E.9040502@powercraft.nl> Date: Wed, 22 Jul 2009 12:10:38 +0200 From: Jelle de Jong MIME-Version: 1.0 To: "linux-media@vger.kernel.org >> \"linux-media@vger.kernel.org\"" Subject: Re: offering bounty for GPL'd dual em28xx support References: <4A6666CC.7020008@eyemagnet.com> <829197380907211842p4c9886a3q96a8b50e58e63cbf@mail.gmail.com> In-Reply-To: <829197380907211842p4c9886a3q96a8b50e58e63cbf@mail.gmail.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: linux-media-owner@vger.kernel.org List-ID: Devin Heitmueller wrote: > The issue occurs with various different drivers. Basically the issue > is the device attempts to reserve a certain amount of bandwidth on the > USB bus for the isoc stream, and in the case of analog video at > 640x480 this adds up to about 200Mbps. As a result, connecting > multiple devices can result in exceeding the available bandwidth on > the USB bus. > > Depending on your how many devices you are trying to connect, what > your target capture resolution is, and whether you can put each device > on its own USB bus will dictate what solution you can go with. Hi all, So I felt like doing a field test, with my dvb-t test system. Bus 001 Device 008: ID 2040:6502 Hauppauge WinTV HVR-900 Bus 001 Device 007: ID 2304:0226 Pinnacle Systems, Inc. [hex] PCTV 330e Bus 001 Device 005: ID 0b05:173f ASUSTek Computer, Inc. Bus 001 Device 003: ID 2304:0236 Pinnacle Systems, Inc. [hex] Bus 001 Device 002: ID 15a4:9016 I have now three devices with dvb-t channels running with different channels and audio on an atom based cpu without problems. two: dvb-usb-dib0700 and one: dvb-usb-af9015 the dvb-usb-af9015 takes way more cpu interrupts because of the usb block size. prove: http://imagebin.ca/img/xM9Q7_A.jpg I will be demonstrating this at har2009 (see demonstration village) Devin could you login onto the dvb-t test system and see if you can get those em28xx device running with your new code? I will probably make an other test system with some more cpu power to see if even more usb devices are possible, or I may use my nice powerful multiseat quad core system for it. Best regards, Jelle de Jong