[linux-audio-user] Jack and SHM

Christophe Vescovi vescovi at lpsc.in2p3.fr
Thu Jan 22 03:45:29 EST 2004

Since there has been a lot of post concerning jack usage and 
optimisation recently it has remind me a problem I got that I never been 
able to understand.
I have never been able to run jackstart with -R option when compiling 
jack with Sys V shm support. jackd -R as root work with SysV shm but if 
I want to use jackstart I have to use POSIX shm.
The error message I am getting with SysV shm is the classical "cannot 
lock down memory for RT thread (Cannot allocate memory)".
I am running a Mandrake 9.2 multimedia kernel (2.4.22, low latency, 
preemption and capability patches).
Since most of jack users seem to use SysV shm I don't understand why I 
cannot (I am the only exception ....)


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