On 10/12/05, Matt Garman <[EMAIL PROTECTED]> wrote: > 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
This is good but expected since root canalways access the capabilities required to run realtime...but... > 9434 pts/1 SLl 0:09 alsaplayer -o jack ...alsaplayer requires that you say you want to use realtime capabilities: alsaplayer -r -o jack This should work better. Give it a try. man alsaplayer for more options and info.) > > # 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? Nice should not be necessary. > > 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? > Yeah, just the -r most likely. Also, depending on your sound card 128/2 might be a bit tight, but let's try for it and see what happens. - Mark -- gentoo-user@gentoo.org mailing list
