18 Dec
2009
18 Dec
'09
2:25 a.m.
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...
Have a look at the SCHED_FIFO section in 'man sched_setscheduler'
<http://linux.die.net/man/2/sched_setscheduler>
The 'realtime' jack option relates to the use of SCHED_FIFO (ie the
scheduling priority) on selected jack threads (but not all!). The
'realtime' kernel patch relates to different issues, eg, allowing user
processes to preempt kernel processing when possible && appropriate,
thus reducing inherent processing latencies. So the jack -R option is
desirable regardless of which kernel you're running. That's hardly a
complete description of the matter, but I think it's close enough for
now :-).
cheers, Cal