Hi,
   This is AMD64, but more likely it's me doing something wrong. I'm
posting this here as this list suggested I look at schedtool for
running SCHED_FIFO on my jackd processes, so I tried it. Clamitous
results!

   I'm guessing about how to run it so I tried like the example on the
man page for mplayer, except using SCHED_FIFO. Since I have
realtime-lsm installed and can normally run jackd realtime as a user
I'm using schedtool as a user also. Any known problems?

[EMAIL PROTECTED] ~ $ schedtool -F -p 20 -e qjackctl
[EMAIL PROTECTED] ~ $

QJC starts fine:

[EMAIL PROTECTED] ~ $ schedtool 7861
PID  7861: PRIO  20, POLICY F: SCHED_FIFO  , NICE   0, AFFINITY 0x1
[EMAIL PROTECTED] ~ $

If I immediately quit QJC I come back to the command line correctly.
This is good.

If I start the jackd server from within QJC it seems to get SCHED_FIFO
priorities:

[EMAIL PROTECTED] ~ $ schedtool 7901
PID  7901: PRIO  20, POLICY F: SCHED_FIFO  , NICE   0, AFFINITY 0x1
[EMAIL PROTECTED] ~ $

However, if at this point I try to stop the jack server from within
QJC the machine locks hard and only a reset button push gets it going
again.

I tried it with both gentoo-sources and ck-sources. Same results both ways. 

What am I doing wrong?

Thanks,
Mark

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