[ardour-users] Jack is Jacked

[Paul Davis]

On Thu, 2006-03-30 at 07:38 -0800, Mike Fisher wrote:
> It turns out I had two installs of jack and qjackctl... I still get
> some errors though
> 
> --> cannot write to jackstart sync pipe 4 (Bad file descriptor)
> jackd: wait for startup process exit failed

do not use jackstart to start jackd on a 2.6 series kernel. we really
need to get rui to remove this option from qjackctl. jackstart is
exclusively for use on 2.4 kernels.

> -->cannot lock down memory for RT thread (Cannot allocate memory)
> -->cannot use real-time scheduling (FIFO at priority 9) [for thread
> 147458, from thread 147458] (1: Operation not permitted)
> -->cannot use real-time scheduling (FIFO at priority 20) [for thread
> 49156, from thread 49156] (1: Operation not permitted)
> -->cannot use real-time scheduling (FIFO at priority 10) [for thread
> 65541, from thread 65541] (1: Operation not permitted)
> 
> I'm going to try rebuilding alsa and then jack again... perhaps this
> will help

no, that won't help. you don't have permission to run apps with realtime
scheduling. the way to fix this depends a lot on which kernel you are
running and which distribution.

--p