[PD] Latency under Linux/Jack (again...)
Raphael Raccuia
rafael.raccuia at blindekinder.com
Tue Oct 19 20:45:48 CEST 2010
I use nvidia... What is considered as an acceptable latency in pure
data? As I said, I have about 13ms @ 48000... but these DIO errors too...
Bernardo Barros a écrit :
> 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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