[Jack-Devel] R: Jack on arm hf

> -----Messaggio originale-----
> Da: [hidden] [mailto:jack-devel-
> [hidden]] Per conto di [hidden]
> Inviato: lunedì 6 maggio 2013 17:25
> A: Robin Gareus
> Cc: Jack mailing list
> Oggetto: Re: [Jack-Devel] Jack on arm hf
>
> Hi Robin and all,
>
> hmm, that last commit is from two months ago. I'm quite sure I'm using
> that patch already. I'm using a self-compiled version of jackd2 1.9.10  on
> a special distribution made for these sticks called Picuntu with no window
> manager.
>
> I just tried again with the built in hdmi interface after unsuccessful
> attempts with a usb interface:
>
> When I try to connect SuperCollider or just the jack_simple_client I get
> similar errors like this:
>
> "Cannot lock down 68157440 byte memory area (Cannot allocate memory)
> Cannot lock down 2048917504 byte memory area (Cannot allocate memory)
> Cannot lock down 25165824 byte memory area (Cannot allocate memory) You
> cannot set callbacks on an active client no physical playback ports
> axel@picuntu:$ Unknown error...
> terminate called after throwing an instance of
> 'Jack::JackTemporaryException'
> what():"
>


I think I can answer this one.
The "cannot lock down..." messages are due to the use of mlock. You need to be root (or have CAP_IPC_LOCK) to do that.
But even if that call fails, the server should work fine. The memory could be swapped out though.


> That's an impressive amount of memory jack wants to allocate ;-)
>

You can start jackd with a smaller maximum number of ports. The default is much higher than needed in most circumstances.

Try starting jackd with --port-max 256 or something closer to the amount of ports you plan on using.
There is also a #define somewhere to limit the number of ports per client, and that lets you limit the amount of locked down ram a bit more.

Cheers,
Luciano

> So, still no luck...
>
> Cheers,
> Axel
>
>
>
> > -----Ursprüngliche Nachricht-----
> > Von: Robin Gareus
> > Gesendet: Mo. 06.05.2013 00:19
> > An: [hidden]
> > Kopie: Jack mailing list
> > Betreff: Re: [Jack-Devel] Jack on arm hf
> >
> > Hi Axel,
> >
> > Recent jack2 from git works on armhf (as well as aarm64 and armel).
> >
> > relevant commits are
> > >
> href="https://github.com/jackaudio/jack2/commit/2f7d512b419cb75cef2e27db87
> 2d641de6e7aa0d"
> > target="_blank">https://github.com/jackaudio/jack2/commit/2f7d512b419c
> > b75cef2e27db872d641de6e7aa0d
> > and
> > >
> href="https://github.com/jackaudio/jack2/commit/d11bb095291d8880508c87adfe
> 625bf2bcab1456"
> > target="_blank">https://github.com/jackaudio/jack2/commit/d11bb095291d
> > 8880508c87adfe625bf2bcab1456
> >
> > Which version of jack are you using and on what distribution?
> >
> > Cheers!
> > robin
>
>
>
>
>
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