On Thu, Oct 06, 2005 at 10:39:44AM -0700, Mark Knecht wrote:
> 1) First, let's determine whether you need a new kernel. su to
> ...
> jackd -R -dalsa -r44100 -dhw -p128 -n2
> alsaplayer -o jack
> ...
> longer test. Any skipping?
Nope, not when running jackd+alsaplayer as root.
However, when running jackd+alsaplayer as a regular user, I get lots
of skipping.
> If you have skipping at this point then you most likely need a
> real-time kernel. My 32-bit machines do not. They run fine with
> gentoo-sources, but my amd64 doesn't run well and needed a new
> realtime kernel to work right.
FWIW, before posting this message, I followed a jack howto (can't
remember the exact source), which walked me through recompiling my
kernel (with "[*] Enable different security models" and "<M>
Default Linux Capabilities"), as well as installing and setting
realtime-lsm up correctly...
> 2) Assuming that your tests as root go well, then emerge
> realtime-lsm. This may require a new kernel if you don't have the
> right Linux Securities stuff enabled:
...but because I'm error-prone, I double-check my configuration. As
far as I can tell, I have everything set up correctly.
>From what I can tell, it appears that when I run jackd and
alsaplayer as a non-root user, they automatically get nice'ed, and I
believe this is what is causing the skipping.
For example, as root:
# ps ax | grep jack
9430 pts/1 SLl 0:08 jackd -R -dalsa -r44100 -dhw -p128 -n2
9434 pts/1 SLl 0:09 alsaplayer -o jack
# top
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
9430 root 18 0 28196 27m 2344 S 2.3 2.7 0:08.68 jackd
9434 root 15 0 61852 60m 9336 S 2.0 6.0 0:09.89 alsaplayer
But as a regular user:
# ps ax | grep jack
9661 pts/11 SNLl 0:00 jackd -R -dalsa -r44100 -dhw -p128 -n2
9665 pts/11 SNLl 0:00 alsaplayer -o jack
# top
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
9665 garman 20 5 61868 60m 9336 S 2.0 6.0 0:00.86 alsaplayer
9661 garman 22 5 28200 27m 2344 S 1.7 2.7 0:00.82 jackd
Notice the "N" (nice) flag for ps, and the niceness value of 5 in
top?
I even tried invoking jackd with the nice program (e.g. "nice -n 0
jackd ..."), but still got stuck the result above.
Hopefully I'm missing something simple... any thoughts?
Thanks!
Matt
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Matt Garman
email at: http://raw-sewage.net/index.php?file=email
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