[LAD] JACK on Raspberry Pi

Gabriel M. Beddingfield gabrbedd at gmail.com
Fri Sep 14 12:42:21 UTC 2012

On 09/14/2012 05:39 AM, Parisson wrote:
> Hi!
> I'm trying to get JACK working on this great tiny box:
> pi at raspberrypi ~ $ jackd -dalsa
> jackdmp 1.9.9
> Copyright 2001-2005 Paul Davis and others.
> Copyright 2004-2012 Grame.
> jackdmp comes with ABSOLUTELY NO WARRANTY
> This is free software, and you are welcome to redistribute it
> under certain conditions; see the file COPYING for details
> JACK server starting in realtime mode with priority 10
> Cannot lock down 82274202 byte memory area (Cannot allocate memory)
> Bus error

When you built Jack2... it looks like you enabled performance tracing. 
When you do this it has to allocate a Really Big ringbuffer in memory.

To fix it -- disable this at compile time.

> As ALSA is OK (i.e. aplay is playing good) and RAM=192M, is there any JACK
> parameter I could tune in to reduce the memory size lock?

Yeah, sucking up half your memory will probably always fail. :-)


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