[PD] Latency under Linux/Jack (again...)

[Bernardo Barros]

I had problems with xruns using the nouveau driver, the nvidia driver
improved performance here. Hope that this helps.

2010/10/18 Raphael Raccuia <rafael.raccuia at blindekinder.com>:
> I still have a lot of DIO errors... no idea how to manage that?
> "I also do get some xruns now and then when moving around gui object"
> I have a lot (1 every 30 sec when I don't touch nothing, more if I play with
> a patch), and they are really audibles...
> r
>
> Raphael Raccuia a écrit :
>>
>> tried with just one security config, no changes...
>>
>> Lorenzo a écrit :
>>>
>>>> -RME Multiface I /HDSP expresscard
>>>>
>>>
>>> So this (not the pcmcia) works on linux? That's interesting news.
>>
>> OT: it should... I asked on many forums to be sure it does, and people
>> said me "it's basically the same as pcmcia"... but I have a lot of trouble:
>> freeze on boot 9/10... but 1/10, when it works it works pretty good! It
>> could be a hardware issue (my computer). I'm talking with a RME technician
>> to fix it, or almost know where the problem comes from...
>>>
>>> I also do get some xruns now and then when moving around gui object (like
>>> selecting a whole lot of objects and moving them around) even with rt
>>> kernel, pd run with -rt etc etc...
>>> Otherwise it is usually *quite* stable.
>>>
>>> Lorenzo
>>>>
>>>> Of course jack run with -R. I repeat I don't have any problem to run
>>>> application with really good latency: yesterday, I forgot to increase
>>>> buffer as I worked on a 96000Hz Ardour session... I noticed I was
>>>> working at 5ms I/O after one hour recording and playing a lot of tracks,
>>>> and no xrun, no problems...
>>>> I also think it's not a good Idea to run pd as root... and I suppose
>>>> other application won't connect to jack if I run it as root also.
>>>>
>>>> I noticed I had two times the @audio config (limits.conf, audio.conf).
>>>> You'll say: "better twice than nothing"... But maybe it generates a
>>>> conflict... I try
>>>>
>>>> Le mardi 12 octobre 2010 à 11:50 -0300, Bernardo Barros a écrit :
>>>>
>>>>>
>>>>> Don't run programs as root, your system will be as insecure as a
>>>>> windows box...
>>>>> Just allow rt privileges to the audio group, and add yourself to this
>>>>> group.
>>>>> Then start jack with rt privileges. All software linked to Jack will
>>>>> run with -rt.
>>>>>
>>>>> from http://jackaudio.org/faq
>>>>>
>>>>> JACK requires real-time scheduling privileges for reliable,
>>>>> dropout-free operation. The server requests these privileges when
>>>>> running with the -R option.
>>>>>
>>>>> Most recent distributions use PAM to manage the permissions of users
>>>>> on a relatively granular level. If the file /etc/security/limits.conf
>>>>> exists on your system, it is using PAM. In order to configure PAM such
>>>>> that normal users can run jackd with realtime privileges make sure the
>>>>> following lines exist:
>>>>> @audio   -  rtprio     99
>>>>> @audio   -  memlock    unlimited
>>>>>
>>>>>
>>>>> 2010/10/12 Pedro Lopes<pedro.lopes at ist.utl.pt>:
>>>>>
>>>>>>
>>>>>> If you start pd in sudo, you have to connect to jack in sudo mode.
>>>>>> Thus
>>>>>> start jack in sudo (or gksudo for qjackctl).
>>>>>> I advise to use an rt kernel too. See documentation of Ubuntu Studio.
>>>>>>
>>>>>> On Tue, Oct 12, 2010 at 3:27 PM, Raphael Raccuia
>>>>>> <rafael.raccuia at blindekinder.com>  wrote:
>>>>>>
>>>>>>>
>>>>>>> Hi list,
>>>>>>> I tested Pd rt as I need low latency for a performance next week...
>>>>>>> It seems -rt flag doesn't have any effect. I measured Pd latency with
>>>>>>> jdelay, and always get 640 (@48000), so about 13ms (pd only)... lower
>>>>>>> I
>>>>>>> set buffer in jack (no less than 256), more DIO errors I get... and
>>>>>>> there are a lot! This setting works great with many application
>>>>>>> (Ardour...), with about 10ms (~15 really). So I would have ~25ms,
>>>>>>> which
>>>>>>> is acceptable, but too many DIO errors!
>>>>>>>
>>>>>>> -what is -defeatrt setting? (I tried 0 and 1, no change)
>>>>>>> -why is -rt flag without effect?
>>>>>>> -tried nosleep, no change...
>>>>>>>
>>>>>>> I also tried to start pd in root (sudo)...
>>>>>>>
>>>>>>> It says:
>>>>>>> priority 8 scheduling enabled.
>>>>>>> priority 6 scheduling enabled.
>>>>>>> (which I normally don't have)
>>>>>>>
>>>>>>> but unfortunately can't connect to jack (state 17)
>>>>>>>
>>>>>>> thank's for your help
>>>>>>>
>>>>>>>
>>>>>>> _______________________________________________
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>>>>>>>
>>>>>>
>>>>>>
>>>>>> --
>>>>>> Pedro Lopes (ongoing MSc)
>>>>>> contact: pedro.lopes at ist.utl.pt
>>>>>> website: http://web.ist.utl.pt/Pedro.Lopes
>>>>>>
>>>>>> _______________________________________________
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>>>>>>
>>>>>>
>>>>
>>>>
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>>>
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