From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from 7of9.schinagl.nl ([88.159.158.68]:58733 "EHLO 7of9.schinagl.nl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754417Ab3CFTwM (ORCPT ); Wed, 6 Mar 2013 14:52:12 -0500 Message-ID: <51379EB3.3040900@schinagl.nl> Date: Wed, 06 Mar 2013 20:53:23 +0100 From: Oliver Schinagl Reply-To: oliver+list@schinagl.nl MIME-Version: 1.0 To: Jean Delvare CC: Linux Media , Mauro Carvalho Chehab , Martin Blumenstingl Subject: Re: drxk driver statistics References: <20130306183604.3015c1f0@endymion.delvare> In-Reply-To: <20130306183604.3015c1f0@endymion.delvare> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-media-owner@vger.kernel.org List-ID: On 03/06/13 18:36, Jean Delvare wrote: > Hi all, > > I have a TerraTec Cinergy T PCIe Dual card, with DRX-3916K and > DRX-3913K frontends. I am thus using the drxk dvb-frontend driver. > While trying to find the best antenna, position and amplification, I > found that the statistics returned by the drxk driver look quite bad: > > $ femon -H 3 > FE: DRXK DVB-T (DVBT) > status SCVYL | signal 0% | snr 0% | ber 0 | unc 38822 | FE_HAS_LOCK > status SCVYL | signal 0% | snr 0% | ber 0 | unc 38822 | FE_HAS_LOCK > status SCVYL | signal 0% | snr 0% | ber 0 | unc 38822 | FE_HAS_LOCK > > This is with TV looking reasonably good, so these figures are not > plausible. > > $ femon 10 > FE: DRXK DVB-T (DVBT) > status SCVYL | signal 00de | snr 00f5 | ber 00000000 | unc 000097a6 | FE_HAS_LOCK > status SCVYL | signal 00f0 | snr 00f5 | ber 00000000 | unc 000097a6 | FE_HAS_LOCK > status SCVYL | signal 0117 | snr 00f6 | ber 00000000 | unc 000097a6 | FE_HAS_LOCK > status SCVYL | signal 00b6 | snr 00eb | ber 00000000 | unc 000097a6 | FE_HAS_LOCK > status SCVYL | signal 00d1 | snr 00e7 | ber 00000000 | unc 000097a6 | FE_HAS_LOCK > status SCVYL | signal 0073 | snr 00ea | ber 00000000 | unc 000097a6 | FE_HAS_LOCK > status SCVYL | signal 00a3 | snr 00ee | ber 00000000 | unc 000097a6 | FE_HAS_LOCK > status SCVYL | signal 00b5 | snr 00f4 | ber 00000000 | unc 000097a6 | FE_HAS_LOCK > status SCVYL | signal 00ba | snr 00f3 | ber 00000000 | unc 000097a6 | FE_HAS_LOCK > status SCVYL | signal 00be | snr 00f0 | ber 00000000 | unc 000097a6 | FE_HAS_LOCK > > Signal values are changing too much, snr is stable enough but way too > low, ber is apparently unimplemented, and unc is never reset AFAICS (it > started at 1 when the system started and has been only increasing since > then.) On my previous card, unc was an instant measurement, not a > cumulative value, not sure which is correct. Yes I found that out aswell, but since image quality has always been very fine, I haven't looked what this all should be. > > I would like to see these statistics improved. I am willing to help, > however the drxk driver is rather complex (at least to my eyes) and I > do not have a datasheet so I wouldn't know where to start. Is there > anyone who can work on this and/or provide some guidance? > > Thanks, >