Re: [linux-dvb] DVB-T USB dib0700 device recommendations?
On Mon, Apr 13, 2009 at 4:18 AM, Marco Borm linux-...@retrodesignfan.eu wrote: Hi Henrik, one of the cards in my system is the dib0700 based 'Hauppauge Nova-T 500. Compared with the TerraTec Cinergy 1400 I would say that the receiver sensitivity is worse but the main problem I have is that the card consumes a loot of energy (8-13W), which is much more than the Terratec(5-6W). That's a little bit weird USB itself should provide max 5V 500mA which would be 2.5 Watt; if it requires more then the device has to be self powered. Maybe you can try to use a different USB device (eg. storage) just for testing the consumption. USB is supposed to require alot power (the controller). You might try to unload the ehci/ohci driver too. Markus I calculated this using measure values of the whole system captured with a Conrad/Voltcraft Energy Monitor 3000. Personally I am little bit shocked about that and wondering if this can be true because the dib is a USB-device, but the Voltcraft is one of the better measurement device. Maybe the VIA usb-hub controller on the board is the problem?! Would be interesting of someone has the same or other experiences with this card or other PCI based cards. Hauppauge ignores all my questions, so I can't recomment products of this manufacturer anyway. Greetings, Marco H. Langos wrote: I've been trying to minimize energy consumption [...] But before running out in the street and buying the first dib0700 device I'd like to know if there are any devices that are - especially good [...] or - especially bad [...] ___ linux-dvb users mailing list For V4L/DVB development, please use instead linux-media@vger.kernel.org linux-...@linuxtv.org http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb ___ linux-dvb users mailing list For V4L/DVB development, please use instead linux-media@vger.kernel.org linux-...@linuxtv.org http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb -- 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: [linux-dvb] DVB-T USB dib0700 device recommendations?
Hi Markus, it seams that you don't know what the Hauppauge Nova-T 500 is: Its not a USB device itself, its a PCI card with a VIA PCI/USB-Bridge Chip connected to multiple DIBcom USB chips: http://www.bttv-gallery.de/high/bttv-gallery.html I bought the card with the idea in mind that it uses low power USB technology, but that was a mistake. Next time I will buy a real usb device and know it isn't allowed to eat more than 2.5W. Greetings, Marco Markus Rechberger wrote: On Mon, Apr 13, 2009 at 4:18 AM, Marco Borm linux-...@retrodesignfan.eu wrote: Hi Henrik, one of the cards in my system is the dib0700 based 'Hauppauge Nova-T 500. Compared with the TerraTec Cinergy 1400 I would say that the receiver sensitivity is worse but the main problem I have is that the card consumes a loot of energy (8-13W), which is much more than the Terratec(5-6W). That's a little bit weird USB itself should provide max 5V 500mA which would be 2.5 Watt; if it requires more then the device has to be self powered. Maybe you can try to use a different USB device (eg. storage) just for testing the consumption. USB is supposed to require alot power (the controller). You might try to unload the ehci/ohci driver too. Markus I calculated this using measure values of the whole system captured with a Conrad/Voltcraft Energy Monitor 3000. Personally I am little bit shocked about that and wondering if this can be true because the dib is a USB-device, but the Voltcraft is one of the better measurement device. Maybe the VIA usb-hub controller on the board is the problem?! Would be interesting of someone has the same or other experiences with this card or other PCI based cards. Hauppauge ignores all my questions, so I can't recomment products of this manufacturer anyway. Greetings, Marco H. Langos wrote: I've been trying to minimize energy consumption [...] But before running out in the street and buying the first dib0700 device I'd like to know if there are any devices that are - especially good [...] or - especially bad [...] ___ linux-dvb users mailing list For V4L/DVB development, please use instead linux-media@vger.kernel.org linux-...@linuxtv.org http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb ___ linux-dvb users mailing list For V4L/DVB development, please use instead linux-media@vger.kernel.org linux-...@linuxtv.org http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb ___ linux-dvb users mailing list For V4L/DVB development, please use instead linux-media@vger.kernel.org linux-...@linuxtv.org http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb -- 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: [linux-dvb] DVB-T USB dib0700 device recommendations?
On Mon, Apr 13, 2009 at 08:54:09AM +0200, Markus Rechberger wrote: On Mon, Apr 13, 2009 at 4:18 AM, Marco Borm linux-...@retrodesignfan.eu wrote: H. Langos wrote: I've been trying to minimize energy consumption [...] But before running out in the street and buying the first dib0700 device I'd like to know if there are any devices that are - especially good [...] or - especially bad [...] Hi Henrik, one of the cards in my system is the dib0700 based 'Hauppauge Nova-T 500. Compared with the TerraTec Cinergy 1400 I would say that the receiver sensitivity is worse but the main problem I have is that the card consumes a loot of energy (8-13W), which is much more than the Terratec(5-6W). That's a little bit weird USB itself should provide max 5V 500mA which would be 2.5 Watt; if it requires more then the device has to be self powered. I agree, it is wierd, there is a lot of hardware out there that strains the usb power supply way beyond the secified 500mA but that alone can't explain the 8-13 Watt. My guess is, that the rest of your system uses more energy because it has to deal with a USB device instead of a PCI device. There is different hardware involved that otherwise might not be powered at all and there's the whole USB protocol stack that is involved and possibly a usb hid device (the remote) that has to be polled x times per second. Don't let a name like interrupt transfer mode fool you. USB transfers are always initiated by the host, so it has to poll input devices a lot. How exactly did you measure the power usage? Did you run the same software to test it? (zap uses way less energy than vdr) The same channel? (Different bitrates even within the same channel can have some effects) I tried to minimize the effects of the software by making sure that an idle system with the hardware installed has the same cpu load and wakups-per-second as the system without that hardware. But it admit i didn't measure power usage directly. Since I am only dealing with usb devices, I could run the usb pin 1 through an amp meter... Maybe you can try to use a different USB device (eg. storage) just for testing the consumption. USB is supposed to require alot power (the controller). You might try to unload the ehci/ohci driver too. Yeap, thats the way to go. And try running powertop to see if your cpu does any extra work even when it should be idle. I calculated this using measure values of the whole system captured with a Conrad/Voltcraft Energy Monitor 3000. Personally I am little bit shocked about that and wondering if this can be true because the dib is a USB-device, but the Voltcraft is one of the better measurement device. Does it deal well with switched-mode power supplies? Those things tend to confuse power measuring devices unless they have a good active PCF. Maybe the VIA usb-hub controller on the board is the problem?! Could be part of the problem. Would be interesting of someone has the same or other experiences with this card or other PCI based cards. Hauppauge ignores all my questions, so I can't recomment products of this manufacturer anyway. Good to know. Thank you! cheers -henrik -- 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: [linux-dvb] DVB-T USB dib0700 device recommendations?
Hi Guys, [snip] Maybe the VIA usb-hub controller on the board is the problem?! Could be part of the problem. Would be interesting of someone has the same or other experiences with this card or other PCI based cards. Hauppauge ignores all my questions, so I can't recomment products of this manufacturer anyway. Good to know. Thank you! cheers -henrik -- I try to avoid, when ever possible, to participate in such statements. I don't even posses currently and never did previously any Hauppauge device. That you may end up in some m$ support only ring in somewhere on the planet is also very likely too, but we also had very different results in the past even for that. In fact, Hauppauge's GNU/Linux support, let's say during the last five years, is such outstanding well, that it is not even worth to try to start counting, who other OEM can even come close to it. On the higher level, chip manufacturers, we also had very good support from Philips/NXP. What you likely don't see is, that people who did this, did it still in their unpaid and limited free time, but m$ driver only colleagues at work might have helped as well sometimes. And there is still a huge market for v4l-dvb related devices going over the whole globe, it still increases like mad. It is a, count up yourself, N $ market each year. Since a lot of fish is springing out of the water, because of that, we have this NDA problem. So, if you would like to have an argument on this issue, you should be able to count who has contributed _despite_ of that and you don't know. Cheers, Hermann -- 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
