Re: [Q]: any DVB-S2 card which is 45MS/s capable?
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, Emmanueleall...@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 majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line unsubscribe linux-media in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [Q]: any DVB-S2 card which is 45MS/s capable?
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 -- To unsubscribe from this list: send the line unsubscribe linux-media in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [Q]: any DVB-S2 card which is 45MS/s capable?
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 -- To unsubscribe from this list: send the line unsubscribe linux-media in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [Q]: any DVB-S2 card which is 45MS/s capable?
On Tue, Jul 27, 2010 at 5:52 AM, Emmanuel eall...@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 majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [Q]: any DVB-S2 card which is 45MS/s capable?
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 3 Yes that I know, dvb-s up to 45MS/s is OK though I cant test that here, but DVB-S2 is limited to 3 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 -- To unsubscribe from this list: send the line unsubscribe linux-media in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [Q]: any DVB-S2 card which is 45MS/s capable?
Look at the vp-1041 I think. -- To unsubscribe from this list: send the line unsubscribe linux-media in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
[Q]: any DVB-S2 card which is 45MS/s capable?
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 -- To unsubscribe from this list: send the line unsubscribe linux-media in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [Q]: any DVB-S2 card which is 45MS/s capable?
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 3 Goga -- To unsubscribe from this list: send the line unsubscribe linux-media in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
