[vdr] Re: My solution to " VDR frozen every 2 seconds"

[Andreas Schultz <aschultz@cs.uni-magdeburg.de>]

Hi,

On Saturday 27 April 2002 16:13, Maxime GUILBOT wrote:
> Maxime GUILBOT
>
> Hi everybody,
> I had a problem, DVD playing was not smooth, the picture was forzen every x
> seconds, and it made the dvd unusable.
> But, after tuning many parameters (hdparm, /proc/ide/hdc/settings,...) I
> found my solution,

Wow, thanks a lot for that information, suddenly everything is clear. Any 
readahead on encrypted discs has to be deadly as is might read data from 
sectors for which we have not yet authenticated.
In the next version, i'll try to disable readahead from vdr directly.

Andreas

> I put file_readahead to 0 and breada_readahead to 0 and dvd playing is
> perfect, no image frozen, fast dvd menu on my pentium 133mhz, I only have
> 30% of the cpu used with ac3 over dvb-s 2.1.
> I someone have the same problem, he could try it :
> echo file_readahead:0 > /proc/ide/hdc/settings
> echo breada_readahead:0 > /proc/ide/hdc/settings
> echo dsc_overlap:1 > /proc/ide/hdc/settings
>
> I still have some kernel : buffer empty messages but without any
> consequences on dvd playback.
> Thank you Andreas for your great work, now I can play again my dvds.
> Don't ask me why it works with these parameters, if someone can explain it
> to me...
> Maxime.