[linux-dvb] Re: Busy waiting in i2c_busy_rise_and_fall (was: Re: Re: full featured card without signal and required video memory investigation)

[Oliver Endriss <o.endriss@gmx.de>]

On Sunday 13 July 2003 20:21, Andreas Kool wrote:
> I can confirm the faster firmware upload and faster tuning here with
> my DVB-C rev1.3

Apparently the speedup of the I2C transfers is the main improvement of 
the patch. Hopefully all devices can handle a 275 kHz clock rate.
I don't know why the I2C bus clock was set to 10.3 kHz.

> But if i'm unplug the antenna cable (please remember: DVB-C), the
> kdvb-fe-0:0 process jumps to 43,1% CPU-load like always :-(

Meanwhile I did a bit more testing and found that the cpu load caused by 
the frontend process varies. I was not able to reproduce the good 
results of my first test but the load is still below 14% (before 
30-35%). Strange.

> But new: If i re-attach the antenna cable, the actually tuned
> programme reapears after no visible delay - great!

Is this really caused by the patch? If yes, I don't know why. ;-)

Oliver


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