[linux-audio-user] Jack and SHM

Steve Harris S.W.Harris at ecs.soton.ac.uk
Thu Jan 22 04:51:00 EST 2004

On Thu, Jan 22, 2004 at 09:45:29 +0100, Christophe Vescovi wrote:
> 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 ....)

Have you strace'd it to find out what its trying to do? might give some

- Steve

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