Re: [linux-audio-user] Ingo's RT patch: please tell this newbie the best jack settings

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To: A list for linux audio users <linux-audio-user@...>
Date: Friday, November 11, 2005 - 4:04 am

On 11/10/05, thewade wrote:

A few comments:

1) The current kernel from Ingo would be 2.4.16-rt9. I think that rt5
didn;t last very long and had some problems. Please try -rt9.

2) Make sure you reinstall the realtime-lsm package after building that kernel.

3) Make sure you create a realtime group and modprobe realtime to
enable that group:

modprobe realtime gid=600 any=1

where gid=600 is for my realtime group in /etc/groups.

4) Making best use of the kernel requires that you understand the ISR
number for your sound card and reset it's priority higher. This helps
a lot in reducing or eliminating xruns.

5) Remove .jackrc completely and let your system set a new one.

6) Here are my HDSP 9652 settings:

jackd -R -p 64 -d alsa -r 44100 -p 64 -n2 -d hw:1,0

I get a few xruns at -p 64 -n2. I get none at -p 256 -n 2. I am still
looking for the root cause of the few xruns I get at 64/2.

7) Make sure you have the Jack FIFOS mounted on tmpfs.

As a comment, I don't personally like Jack in /usr local. You might
consider rebuilding Jack one of these days with:

./configure --prefix=/usr

Hope this all helps a bit,.


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Re: [linux-audio-user] Ingo's RT patch: please tell this new..., Mark Knecht, (Fri Nov 11, 4:04 am)