[Sussex] configuring xine?

[john]

Hi list,

does anyone know anything about configuring xine to play DVD's.

I've managed to get it installed and sort of running, but both the sound and 
video playback are "jumpy"

I found this


"Oki, xine doesn't drop frames now but video output still is not really 
smooth!

Video output can be further improved by tuning your linux kernel: 

Set HZ to 1000 in /usr/src/linux/include/asm-i386/param.h 

Try applying scheduler patches, especially the O(1) and the preemptive patches 
have proven useful at the time of this writing (spring 2003). 
Linux 2.5/2.6 will probably have these improvements out of the box."

at xinehq, but don't quite understand what it's telling me to do, or quite how 
I'd do it.

the /usr/src/linux/include/asm-i386/param.h looks like this

ifndef _ASMi386_PARAM_H
#define _ASMi386_PARAM_H

#include <linux/config.h>

#ifdef __KERNEL__
# define HZ             CONFIG_HZ       /* internal kernel timer frequency */
# define USER_HZ        100             /* some user interfaces are in ticks 
*/
# define CLOCKS_PER_SEC (USER_HZ)       /* like times() */
# define jiffies_to_clock_t(x)  ((x) / ((HZ) / (USER_HZ)))
#endif

#ifndef HZ
#define HZ 200                          /* if userspace cheats, give them 200 
*/
#endif

#define EXEC_PAGESIZE   4096

#ifndef NGROUPS

as you can see, there are various bit's that mention HZ, but which one would I 
change ?

and as I haven't got a scooby what the hell a scheduler or preemptive patch 
is, that ones got me totally stumped.


As usual, any idea's or suggestions are "mucho appreciado"

regards

John D.