[linux-dvb] Re: CPU usage

[Jürgen Peitz <peitz@snafu.de>]

Am Samstag, 19. Oktober 2002 15:21 schrieb Dennis Noordsij:
> Hi,
>
> Got a very solidly working VDR 1.1.13 with 2 DVB-C's and time-shifting
> (record 2 channels on different transponders and view a recording - except
> for the occasional ARM crash :-)
>
> However, CPU usage for system (which I guess would be the DVB drivers)
> ranges from 10-30% on an 800 MHz Duron during transfer mode (VDR usage is
> 3-6%). When all recordings are stopped, it drops to near zero again.
>
> Is there such a thing as a gprof for kernel modules, or (more likely :)
> does anyone where so much time is spent and if there is a way to improve
> upon this?
>
> I was hoping a measly Pentium 133 would be able to make a nice VDR, but
> with this kind of CPU usage it will not work :(
>
> Best regards,
> Dennis

Same problem for me. But I think the CPU time is used by the new VDR version 
and not by the driver.

Have a Pentium 166 running fine with vdr-1.0.4. While recording CPU usage for 
all VDR threads together is never bigger than 10%. 

When I use vdr-1.1.13 with the new driver 
siemens_dvb-0.9.4-2002-06-23.patch.tar.bz2 I have a VDR thread with 75%, 
another one with 15% and one with 10%. So it's using almost all CPU time. 
Also get distortions on the screen and buffer empty messages in syslog. 

Hope that it is possible to find a solution for this, because I really liked 
to reuse my old hardware for such a nice VDR.

Juergen

    


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