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