[linux-dvb] Re: EPG scan cause high load and AC3 drop outs - maybe not solved yet ?

[a.share@t-online.de (Andy)]

> > > Is 1:0 somehow related to the card it is running on ?
> >
> > see driver/dvb_frontend.c at dvb_frontend_thread() ...
> >
> > [...]
> >         snprintf (current->comm, sizeof (current->comm),
"kdvb-fe-%i:%i",
> >                   fe->frontend.i2c->adapter->num, fe->frontend.i2c->id);
> > [...]
> >
> > ... IMHO the first is the card used on the i2c bus (1 == the second),
the
> > second number is the i2c bus its self. What I2C is for see
> > /usr/src/linux/Documentation/Configure.help , search for CONFIG_I2C, and
> > /usr/src/linux/Documentation/i2c/summary .
> >
> > I2C is a slow dog but is used for programming/reading registers of the
> > DVB cards. IMHO there are also missed some
> > request_mem_region()/release_mem_region() within av7110/saa7146_core.c
> > also a better wait mechanism as mdelay().  Maybe the patch attached
> > will help to for this.
> >
> > The thread dvb_frontend_thread() calls dvb_frontend_recover() which is
> used
> > for compensating LNB drift.  IMHO this should not happen (nevertheless
it
> > could be the first reason of the high load!!).
> > Beside this, this is what I've found by searching for lost_sync_count:
> >
> > /**
> >  *  if 2 tuners are located side by side you can get interferences when
> >  *  they try to tune to the same frequency, so both lose sync.
> >  *  We will slightly mistune in this case. The AFC of the demodulator
> >  *  should make it still possible to receive the requested transponder
> >  *  on both tuners...
> >  */
> >
> > ... and this could also explain why users of two or more DVB cards (full
> > featured or not) are `able' to see the phenomena you've described during
> > EPG scans.
> >
> > IMHO the ml linux-dvb@linuxtv.org should notice that (therefore a cross
> > posting is needed IMHO:). For readers of linux-dvb@linuxtv.org: the
> > drop outs are happen during live view of Pro7 which means that the TS
> > stream has longer timeouts beginning with some bit failures which are
> > found by a CRC check of a VDR plugin forwarding the AC3 data stream
> > to the S/P-DIF of a sound card.
> >

I have tried the patch, and it seems the system works much more reliable
with two cards an epg-scanner=on if the patch is used.

I think the driver developer should take a look on it....

Greetings

A.Share




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