From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail.kapsi.fi ([217.30.184.167]:58076 "EHLO mail.kapsi.fi" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753170AbZJZQCE (ORCPT ); Mon, 26 Oct 2009 12:02:04 -0400 Message-ID: <4AE5C7F9.6000502@iki.fi> Date: Mon, 26 Oct 2009 18:02:01 +0200 From: Antti Palosaari MIME-Version: 1.0 To: Devin Heitmueller CC: Linux Media Mailing List Subject: Re: em28xx DVB modeswitching change: call for testers References: <829197380910132052w155116ecrcea808abe87a57a6@mail.gmail.com> <4AE497B5.8050801@iki.fi> <829197380910260836o4b17a65ex8c46d1db8d6d3027@mail.gmail.com> In-Reply-To: <829197380910260836o4b17a65ex8c46d1db8d6d3027@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: Terve Devin, On 10/26/2009 05:36 PM, Devin Heitmueller wrote: > Hello Antti, > > Sorry, I'm a couple of days behind on email. > > On Sun, Oct 25, 2009 at 2:23 PM, Antti Palosaari wrote: >> Reddo DVB-C USB Box works fine with this patch. But whats the status of this >> patch, when this is going to Kernel? Reddo is added to the 2.6.32 and due to >> that I need this go 2.6.32 as bug fix. If this is not going to happen I >> should pull request my fix: >> http://linuxtv.org/hg/~anttip/reddo-dvb-c/rev/38f946af568f > > I've received some very mixed results in terms of testing of the patch > (as you can see from the responses). Even stranger, I received mixed > responses from people with the same boards. I haven't had a chance to > debug *why* the people who raised problems still had an issue. I > continue to believe it's the "right fix" but I don't know why those > people reported problems with it. OK, I will wait then. >> And other issue raised as well. QAM256 channels are mosaic. I suspect there >> is some USB speed problems in Empia em28xx driver since demod UNC and BER >> counters are clean. It is almost 50 Mbit/sec stream... Any idea? I tested >> modprobe em28xx alt=N without success... > > What do you mean by "mosaic"? Can you try using dvbstreamer and see > what the overall throughput is? That will tell us if we are not > getting the whole stream. > > You cannot rely on the "alt=n" for DVB. The max packet size is > determined by an em28xx register. I mean picture is bad, very much errors on stream. Look this thread for sample picture: http://linuxtv.fi/viewtopic.php?t=3661&postdays=0&postorder=asc&start=15 I did some more tests yesterday after sending that mail. Problem seems to be that em28xx does not transfer bytes faster than ~46 Mbit/sec whilst stream is over 50 Mbit/sec. About 5 Mbit/sec is lost... I ensured that comparing towards Anysee E30C Plus DVB-C which has same demodulator (TDA10023). Anysee is just fine, Empia not. I looked stream sizes by using dvbtraffic. Is there any way to speed up Empia to handle streams bigger than ~45 Mbit/sec? regards Antti -- http://palosaari.fi/