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

timecop timecop at gmail.com
Thu Mar 8 05:31:44 CET 2007

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.


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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