From: Oliver Schinagl <oliver@schinagl.nl>
To: Jean Delvare <khali@linux-fr.org>
Cc: Linux Media <linux-media@vger.kernel.org>,
Mauro Carvalho Chehab <mchehab@redhat.com>,
Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Subject: Re: drxk driver statistics
Date: Wed, 06 Mar 2013 20:53:23 +0100 [thread overview]
Message-ID: <51379EB3.3040900@schinagl.nl> (raw)
In-Reply-To: <20130306183604.3015c1f0@endymion.delvare>
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,
>
next prev parent reply other threads:[~2013-03-06 19:52 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-06 17:36 drxk driver statistics Jean Delvare
2013-03-06 19:53 ` Oliver Schinagl [this message]
2013-03-06 21:14 ` Mauro Carvalho Chehab
2013-03-07 21:18 ` Andy Walls
2013-03-07 22:26 ` Mauro Carvalho Chehab
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