[LAU] jack + vanilla kernel

[Leigh Dyer]

Josh Lawrence wrote:
> quick question:
> 
> if you are using jack with a vanilla kernel, should you still keep the
> realtime option enabled in jack, or run jack without the -R?  my
> reasoning tells me that no realtime patch = no realtime in jack, but I
> just wanted to check myself with you all...

Hi Josh,

Scheduling JACK to run with realtime priority (using the -R option) is 
separate to having a kernel that runs with hard realtime pre-emption 
enabled. Ideally, you want both, but on a vanilla kernel, you still want 
the -R option -- indeed, that's how I run my systems.

One way to think of it is that running with realtime priority (with the 
-R option) instructs the kernel to run JACK with the best scheduling it 
can possibly manage. If you also have realtime pre-emption in your 
kernel, though, then the kernel's best effort will be... well, better :)

Thanks
Leigh