[linux-dvb] Re: Linux DVB + PCI bus extender (Magma) - Anyone?

Mark Buechler mark.buechler at gmail.com
Thu Mar 8 13:04:15 CET 2007


Thanks for the info. I was a bit worried about bandwidth but I figured not
many cards are going to be streaming the full transport - certainly not all
at once, anyway, so I think I'm safe there. The only analog capture cards I
own are mpeg ones so that should be good.

Thanks, Mark.

On 3/7/07, timecop <timecop at gmail.com> wrote:
>
> Magma cases, while having their own PCI bridge, still route through a
> single slot.
> Which means, as long as you're not pushing the 133meg/second PCI limit
> - you will be fine. A typical 40mbit full transponder is ~5meg/second,
> so even with 4 cards tuning there shouldn't be a problem.
>
> Note, this is only for DVB cards, when you're dealing with analog
> capture (non-mpeg) boards sending uncompressed video, PCI bandwidth
> gets used up real quick.
>
> -t
>
> On 3/8/07, CityK <CityK at rogers.com> wrote:
> > Mark Buechler wrote:
> > > I suppose nobody has a comment or suggestion on this.. I guess I'm on
> > > my own.
> > >
> > > - Mark.
> > >
> > > On 3/6/07, *Mark Buechler* < mark.buechler at gmail.com
> > > <mailto:mark.buechler at gmail.com>> wrote:
> > >
> > >     I'm looking to purchase a PCI bus extender by Magma to use with my
> > >     Nexus-S, SkayStar2 and Twinhan cards. Before I spend the money,
> > >     however, I wanted to cover my bases and make sure I'm not going to
> > >     run into any latency or timing issues with slots in the extender.
> > >     Has anyone has success using one of these with any DVB cards under
> > >     Linux?
> > >
> > >     Thanks in advance, Mark.
> > >
> >
> > - Probably not a lot of people with first hand experience with such a
> > setup.  Second, the other problem is that the typical end user doesn't
> > hang around here -- users tend to ask a question to a problem that they
> > have and then, once they receive an answer, are never to be heard from
> > again on the list
> > - there are few developers here, and their time is tight ... so giving
> > one days allowance is not necessarily indicative that you are on your
> > own.....sometimes you have to be patient
> >
> > In any regard, I don't know if you would run into similar problems with
> > an extender, but it might be worthwhile to browse through these threads
> > dealing with a problem related to using a pci riser:
> > http://www.linuxtv.org/pipermail/linux-dvb/2007-February/016027.html
> > which stems from this thread:
> > http://www.linuxtv.org/pipermail/linux-dvb/2007-February/015936.html
> >
> > If that strikes you as a possibility, then consider searching (google
> > works well) the achieves for other incidences with extenders or risers.
> >
> >
> >
> > _______________________________________________
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> > linux-dvb at linuxtv.org
> > http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
> >
>
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