[vdr] power consumption, powertop and wakups per second with a af9015 device, vp7045, and various plugins

Heinrich Langos henrik-vdr at prak.org
Fri Mar 27 13:31:15 CET 2009


On Fri, Mar 27, 2009 at 12:57:14PM +0200, Antti Palosaari wrote:
> Heinrich Langos wrote:
>> BTW: I got myself a "Toshiba USB DVB-T Tuner PX1211E-1TVD" based on the
>> DiB3000M-C/P. Unlike the siemens stick it has a pid filter. I only 
>> tested it without the pid filter yet, and it seems to perform as good 
>> as the siemens stick in terms of system load. So I guess it uses big
>> packets for the bulk transfers.
>
> I didn't find that stick from code. I assume it is "LITE-ON USB2.0 DVB-T  
> Tuner" which is sold rebranded as Toshiba (according to one comment in  
> code). If same device then it does have PID filter and uses 4096 BULK  
> packets.

Yeap, thats the one ... see http://www.linuxtv.org/wiki/index.php/DVB-T_USB_Devices

[329345.857835] dvb-usb: found a 'LITE-ON USB2.0 DVB-T Tuner' in warm state.
[329345.859820] dvb-usb: will pass the complete MPEG2 transport stream to the software demuxer.
[329345.862374] DVB: registering new adapter (LITE-ON USB2.0 DVB-T Tuner)
[329345.875554] DVB: registering adapter 0 frontend 0 (DiBcom 3000MC/P)...
[329345.898401] MT2060: successfully identified (IF1 = 1220)
[329346.390290] dvb-usb: LITE-ON USB2.0 DVB-T Tuner successfully initialized and connected.
[329346.390729] usbcore: registered new interface driver dvb_usb_dibusb_mc

Kind of frustrating .. from 3 usb dvb-t receivers that i own, not even 
one is recognized by its real name :-)
At least your af9015 driver doesn't pretend to know the brand.

>> I hope I'll have some time to test it further this weekend. Hopefully 
>> it turns out to reduce the system load by the driver to a reasonable 
>> level.
>> If so I will finally get around to look into vdr itself as a cause of
>> wasted CPU cycles and energy... :-)
>
> I have very many devices but haven't tested loads yet.

Could be interesting. Especially with the whole IT world moving towards 
more energy efficient systems ... 

Do you think we should start to document the findings in the linuxtv wiki?

BTW: I think we might better take this thread to linix-dvb as is now mostly
deals with driver issues and less with vdr. (I would have started it there
but I didn't know the source of the system load nor the layout of 
mailinglists on linuxtv then)


cheers and thank you for your help.

-henrik





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