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

Heinrich Langos henrik-vdr at prak.org
Sun Mar 22 22:40:07 CET 2009


On Sun, Mar 22, 2009 at 06:16:29PM +0100, Martin Emrich wrote:
> Heinrich Langos schrieb:
> >
> > I ran a couple of tests with a different DVB-T USB stick. The rather old
> > "Fujitsu-Siemens DVB-T Mobile TV". That one turns out to need a lot less
> > system resources. It also transfers the whole transport stream (several
> > video and audio streams) over the USB and leaves demuxing to the host. 
> > So we are not comparing apples and oranges.
> >   
> I borrowed an af9015 device some time ago, and the owner told me that 
> the primary problem with it is that it has no hardware PID filter. So 
> even if VDR is only doing EPG scanning, the complete multiplex is 
> congesting the USB link. Maybe your Fujitsu-Siemens receiver has a 
> hardware PID filter...

Hi Martin,

I am pretty sure the Siemens stick doesn't filter PIDs. The easy way to
find out about that is to look at http://www.linuxtv.org/wiki/index.php/DVB-T_USB_Devices
and check if the device works with usb 1.1 or absolutely needs 2.0.

Also the system load doesn't seem to differ a lot between vdr being 
mostly idle and recording.

I'll get my hands onto a "Toshiba USB DVB-T Tuner PX1211E-1TVD" this week. 
That one should have a pid filter as it seems to support USB 1.1 as well as 2.0. 

cheers
-henrik




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