Re: [LAU] Realtime Kernel

When i use a 128 frames buffer i have a latency of 5 ms. This looks enough
for me for any applications. But i don't have any real-time kernel support.
At first i couldn't start jackd with realtime support. It did not start. Bu
after changing my /etc/security/limits.conf file as:
@audio - rtprio 95
@audio - memlock 512000
@audio - nice -19

I could start jackd with realtime flag and now i have a 5 ms of latency.
How that can be without having a Realtime kernel ?

On Tue, Mar 18, 2008 at 8:33 PM, Mark Knecht <markknecht@email-addr-hidden> wrote:

> On Tue, Mar 18, 2008 at 11:25 AM, Arda Eden <ardaeden@email-addr-hidden> wrote:
> > So is it really necessary to have a realtime kernel in order to use
> linux
> > audio applications without any latencies or xruns ?
> >
>
> It is not possible to use ANY kernel with NO latencies. EVERY kernel
> has latencies. The question is how low do you want the latencies to
> be? If you can exist with 50mS or higher you might get away with a
> standard kernel. If you want to run with 1.2mS latency then you will
> absolutely have to have a real-time enabled kernel.
>
> xruns are just an indication of the system not meeting the latency
> requirement you set in Jack, i.e. - a by product of how you answered
> the question in the first paragraph.
>
> - Mark
>

-- 
Arda EDEN
Cumhuriyet University
Faculty of Fine Arts
Department of Music Technology
Sivas/TURKEY

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Received on Wed Mar 19 00:15:04 2008