[PlanetCCRMA] Reliable version of Fedora using rt-kernel?

[John S. Dey]

Hi Fernando,

With the planetccrma-rt-permissions, after fixing what appears to me as a bug, I was able to start jackd in user mode.  I edited the file 99-rt-permissions.conf by changing jack-user to jackuser and logged out and back in.  I am now running with a latency of 5.33ms with reasonable results. By the way--when I changed priorities from 20 to 99 in 99-jack.conf my system started malfunctioning, e.g., I could not get the terminal window application to start.  I corrected the situation by booting in single mode and changing the file back.

Thanks for all your assistance.  Won't it be great when all the real-time stuff gets added to the trunk of linux.  I thought it would have happened long before now.

John 




On Nov 14, 2011, at 9:41 PM, Fernando Lopez-Lezcano wrote:

> On 11/14/2011 05:40 PM, Fernando Lopez-Lezcano wrote:
>> On 11/14/2011 04:49 PM, John S. Dey wrote:
>>> Fernando,
>>> 
>>> Could the file 99-jack.conf in the same directory be causing my problem?
> 
> You could try a new package I released that will set the permissions for you. You can install:
> 
>  yum install planetccrma-rt-permissions
> 
> That will give high priority scheduling (up to 99) and 4G of memory locking only to users that belong to the group "jack-rt" (make sure you are in that group!)
> 
> Or:
> 
>  yum install planetccrma-rt-permissions-all
> 
> Which will give permissions to all users (might open security problems although I have not had that happen to me).
> 
> You will need to logout and login again to test if it works. I only tested the -all package on fc16 and it seems to work for me.
> 
> Let me know how it goes.
> -- Fernando
> 
> 
>>> It contains:
>>> 
>>> ----------
>>> # Default limits for users of jack-audio-connection-kit
>>> 
>>> @jackuser - rtprio 20
>>> @jackuser - memlock 4194304
>>> 
>>> @pulse-rt - rtprio 20
>>> @pulse-rt - nice -20
>>> 
>>> -----------
>> 
>> Hmmm, maybe it is overriding? (I imagine 'p' would be after 'j').
>> 
>> Could you edit that file and change rtprio from 20 to 99?
>> A quick test could also be to start jack with:
>> 
>> jackd -R -P 15 -d alsa -d hw:0 ... etc ...
>> 
>> (ie: setting priority by hand to 15 instead of the default of 60 for rt
>> kernels - not the best choice but it would enable you to run "-R")
>> 
>> -- Fernando
>> 
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