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

[Raphael Raccuia]

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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