[Q]: any DVB-S2 card which is 45MS/s capable?

[Q]: any DVB-S2 card which is 45MS/s capable?

[Emmanuel]

If someone has tested a DVB-S2 card at 45MS/s (I am interested in QPSK 
moslty) please speak out ;-).
I dont need CI, dual tuner can be a bonus but definitely not mandatory.
I already asked the question, so sorry to come back again with it, but I 
did not get a clear answer: the only thing I know is that STV0900 is 
able to do it, but I guess that the board itself must be well thought 
out to achieve these high rates?
TIA
Bye
Manu

Re: [Q]: any DVB-S2 card which is 45MS/s capable?

[Goga777]

> If someone has tested a DVB-S2 card at 45MS/s (I am interested in QPSK 
> moslty) please speak out ;-).
> I dont need CI, dual tuner can be a bonus but definitely not mandatory.
> I already asked the question, so sorry to come back again with it, but I 
> did not get a clear answer: the only thing I know is that STV0900 is 
> able to do it, but I guess that the board itself must be well thought 
> out to achieve these high rates?


my hvr4000 card works well with dvb-s transponder with so high SR - 44950
see tp 11044 on http://www.lyngsat.com/eam22.html

also, no any problems with dvb-s2 tp with SR 30000

Goga

Re: [Q]: any DVB-S2 card which is 45MS/s capable?

[Emmanuel]

Goga777 a écrit :
>> If someone has tested a DVB-S2 card at 45MS/s (I am interested in QPSK 
>> moslty) please speak out ;-).
>> I dont need CI, dual tuner can be a bonus but definitely not mandatory.
>> I already asked the question, so sorry to come back again with it, but I 
>> did not get a clear answer: the only thing I know is that STV0900 is 
>> able to do it, but I guess that the board itself must be well thought 
>> out to achieve these high rates?
>>     
>
>
> my hvr4000 card works well with dvb-s transponder with so high SR - 44950
> see tp 11044 on http://www.lyngsat.com/eam22.html
>
> also, no any problems with dvb-s2 tp with SR 30000
>   
Yes that I know, dvb-s up to 45MS/s is OK though I cant test that here, 
but DVB-S2 is limited to 30000 whereas I have one tp here which is 
DVB-S2, QPSK, FEC 5/6 at 45MS/s.
This is why I am looking for a dvb card which is able to tune to these 
(presumably) extreme rates.
Bye
Manu

Re: [Q]: any DVB-S2 card which is 45MS/s capable?

[VDR User]

Look at the vp-1041 I think.

Re: [Q]: any DVB-S2 card which is 45MS/s capable?

[Emmanuel]

VDR User a écrit :
> Look at the vp-1041 I think.
>
>   
 From what I gathered it is not able to do 45MS/s for DVB-S2.
Thanks anyway,
Manu

Re: [Q]: any DVB-S2 card which is 45MS/s capable?

[VDR User]

On Tue, Jul 27, 2010 at 5:52 AM, Emmanuel <eallaud@gmail.com> wrote:
> VDR User a écrit :
>>
>> Look at the vp-1041 I think.
>
> From what I gathered it is not able to do 45MS/s for DVB-S2.
> Thanks anyway,

You may want to ask Manu Abraham (author of the mantis driver) about
that to be sure.  It seems I recall him telling me it could quite some
time ago.

Re: [Q]: any DVB-S2 card which is 45MS/s capable?

[Marko Ristola]

Hi.

I have written some Mantis bandwidth related
DMA transfer optimizations on June/July this year.
They are now waiting for approval by Manu Abraham.

Those reduce CPU pressure, increasing the bandwidth
that can be received from the DVB card. 45MS/s bandwidth
support will surely benefit from those patches.

Main features:
1. Do one CPU interrupt per 16KB data instead per 4KB data.
My implementation benefits only Mantis cards.
https://patchwork.kernel.org/patch/107036/

2. Remove unnecessary big CPU overhead, when data is delivered
from the DVB card's DMA buffer into Linux kernel's DVB subsystem.
Number 2 reduces the CPU pressure by almost 50%.
This implementation benefits many other Linux supported DVB cards too.
http://patchwork.kernel.org/patch/108274/

Those helped with my older single CPU Core computer with 256-QAM,
delivering HDTV channel into the network and watching the
HDTV channel with a faster computer.

The performance bottlenecks could be seen on the
command line with "perf top".

I had to increase PCI bus latency setting into 64 too from the BIOS.
Moving DVB device into separate IRQ line with Ethernet card helped too,
because Ethernet card did an interrupt per ethernet packet.

So if the hardware can deliver 45MS/s data fast enough, software side 
can be optimized up
to some point. My patches contain the most easy major optimizations that 
I found.
If you can test some of those patches, it might help to get them into 
Linux kernel
faster.

Best regards,
Marko Ristola

27.07.2010 18:11, VDR User wrote:
> On Tue, Jul 27, 2010 at 5:52 AM, Emmanuel<eallaud@gmail.com>  wrote:
>> VDR User a écrit :
>>> Look at the vp-1041 I think.
>>  From what I gathered it is not able to do 45MS/s for DVB-S2.
>> Thanks anyway,
> You may want to ask Manu Abraham (author of the mantis driver) about
> that to be sure.  It seems I recall him telling me it could quite some
> time ago.
> --
> To unsubscribe from this list: send the line "unsubscribe linux-media" in
> the body of a message to majordomo@vger.kernel.org
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>

Re: [Q]: any DVB-S2 card which is 45MS/s capable?

[Emmanuel]

Marko Ristola a écrit :
>
> Hi.
>
> I have written some Mantis bandwidth related
> DMA transfer optimizations on June/July this year.
> They are now waiting for approval by Manu Abraham.
>
> Those reduce CPU pressure, increasing the bandwidth
> that can be received from the DVB card. 45MS/s bandwidth
> support will surely benefit from those patches.
>
> Main features:
> 1. Do one CPU interrupt per 16KB data instead per 4KB data.
> My implementation benefits only Mantis cards.
> https://patchwork.kernel.org/patch/107036/
>
> 2. Remove unnecessary big CPU overhead, when data is delivered
> from the DVB card's DMA buffer into Linux kernel's DVB subsystem.
> Number 2 reduces the CPU pressure by almost 50%.
> This implementation benefits many other Linux supported DVB cards too.
> http://patchwork.kernel.org/patch/108274/
>
> Those helped with my older single CPU Core computer with 256-QAM,
> delivering HDTV channel into the network and watching the
> HDTV channel with a faster computer.
>
> The performance bottlenecks could be seen on the
> command line with "perf top".
>
> I had to increase PCI bus latency setting into 64 too from the BIOS.
> Moving DVB device into separate IRQ line with Ethernet card helped too,
> because Ethernet card did an interrupt per ethernet packet.
>
> So if the hardware can deliver 45MS/s data fast enough, software side 
> can be optimized up
> to some point. My patches contain the most easy major optimizations 
> that I found.
> If you can test some of those patches, it might help to get them into 
> Linux kernel
> faster.
>
> Best regards,
> Marko Ristola
>
OK these optimizations look like a step into the good direction. I guess 
what is also missing is a tuner which can handle that in DVB-S2, which 
does not seem obvious. The mantis card  can do that?
Thx
Bye
Manu

Re: [Q]: any DVB-S2 card which is 45MS/s capable?

[Marko Ristola]

  03.08.2010 06:20, Emmanuel wrote:
> Marko Ristola a écrit :
>>
>> Hi.
>>
>> I have written some Mantis bandwidth related
>> DMA transfer optimizations on June/July this year.
>> They are now waiting for approval by Manu Abraham.
>>
>> Those reduce CPU pressure, increasing the bandwidth
>> that can be received from the DVB card. 45MS/s bandwidth
>> support will surely benefit from those patches.
>>
>> Main features:
>> 1. Do one CPU interrupt per 16KB data instead per 4KB data.
>> My implementation benefits only Mantis cards.
>> https://patchwork.kernel.org/patch/107036/
>>
>> 2. Remove unnecessary big CPU overhead, when data is delivered
>> from the DVB card's DMA buffer into Linux kernel's DVB subsystem.
>> Number 2 reduces the CPU pressure by almost 50%.
>> This implementation benefits many other Linux supported DVB cards too.
>> http://patchwork.kernel.org/patch/108274/
>>
>> Those helped with my older single CPU Core computer with 256-QAM,
>> delivering HDTV channel into the network and watching the
>> HDTV channel with a faster computer.
>>
>> The performance bottlenecks could be seen on the
>> command line with "perf top".
>>
>> I had to increase PCI bus latency setting into 64 too from the BIOS.
>> Moving DVB device into separate IRQ line with Ethernet card helped too,
>> because Ethernet card did an interrupt per ethernet packet.
>>
>> So if the hardware can deliver 45MS/s data fast enough, software side 
>> can be optimized up
>> to some point. My patches contain the most easy major optimizations 
>> that I found.
>> If you can test some of those patches, it might help to get them into 
>> Linux kernel
>> faster.
>>
>> Best regards,
>> Marko Ristola
>>
> OK these optimizations look like a step into the good direction. I 
> guess what is also missing is a tuner which can handle that in DVB-S2, 
> which does not seem obvious. The mantis card  can do that?
According to Internet shops it can.
Manu Abraham has implemented the DVB-S2 support earlier than this summer,
so with my small improvements it could perform better.

Here is a page about DVB-S2 cards that work somehow with Linux:

http://www.linuxtv.org/wiki/index.php/DVB-S2_PCI_Cards

I myself have been testing only with 9600 MS/s with terrestial DVB-C,
so I have no experience with DVB-S2.

With 9600 MS/s and HDTV, the whole system must work, including VDR with 
it's components,
not only the PCI DVB card.
With SDTV, any hardware will do.

Regards,
Marko Ristola

> Thx
> Bye
> Manu
>