Jack doesn't run AudioFire 12 & 8

[L_d_v_c@]

Hello.
Jack1 can run Audiofire 12, but now it must be Jack2.
I recently bought an Audiofire 8, I connected AF8's word clock in to AF12's word clock out, so AF12 is master and AF8 is slave.

It impossible to run Jack2 at 1 ms latency as with Jack 1.
Jack 2 will only run if 128 ms latency (musicians can't play with 128 ms latency, it's impossible ! It must be less than 8 ms, without xruns as Jack 1.)
Celerity is 340 meters per second.
1 ms → 34 cm (ok)
2 ms → 68 cm (ok)
4 ms → 1,36 meter (hard)
8 ms → 2,72 meters (hard)
16 ms → 5,44 meters (Umpossible to play real time)

So why can't we take Jack1 with Ubuntu ? Jack 1 is the only which can run at 0,5 ms !! wuthout Xruns.
My computer is Tyan computer, 2,3 Ghz, 8Gio RAM on http://compositionsludovic.free.fr/projet_tyan_s2915a2nrf-e.php

ludovic@ludovic-SuperOrdinateur:~$ lsb_release -rd
Description: Ubuntu 13.10
Release: 13.10

ludovic@ludovic-SuperOrdinateur:~$ apt-cache policy qjackctl
qjackctl:
  Installé : 0.3.10-2
  Candidat : 0.3.10-2
 Table de version :
 *** 0.3.10-2 0
        500 http://fr.archive.ubuntu.com/ubuntu/ saucy/universe amd64 Packages
        100 /var/lib/dpkg/status

ludovic@ludovic-SuperOrdinateur:~$ apt-cache policy jackd2
jackd2:
  Installé : 1.9.9.5+20130622git7de15e7a-1
  Candidat : 1.9.9.5+20130622git7de15e7a-1
 Table de version :
 *** 1.9.9.5+20130622git7de15e7a-1 0
        500 http://fr.archive.ubuntu.com/ubuntu/ saucy/universe amd64 Packages
        100 /var/lib/dpkg/status
ludovic@ludovic-SuperOrdinateur:~$ apt-cache policy jackd2-firewire

jackd2-firewire:
  Installé : 1.9.9.5+20130622git7de15e7a-1
  Candidat : 1.9.9.5+20130622git7de15e7a-1
 Table de version :
 *** 1.9.9.5+20130622git7de15e7a-1 0
        500 http://fr.archive.ubuntu.com/ubuntu/ saucy/universe amd64 Packages
        100 /var/lib/dpkg/status

Please to make a patch ?

ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: qjackctl 0.3.10-2
ProcVersionSignature: Ubuntu 3.11.0-11.4-lowlatency 3.11.3
Uname: Linux 3.11.0-11-lowlatency x86_64
ApportVersion: 2.12.5-0ubuntu2.1
Architecture: amd64
Date: Wed Nov 6 08:59:42 2013
MarkForUpload: True
SourcePackage: qjackctl
UpgradeStatus: No upgrade log present (probably fresh install)

[Len Ovens (len-ovenwerks)]

On Wed, 6 Nov 2013, L_d_v_c@ wrote:
> Jack1 can run Audiofire 12, but now it must be Jack2.
> I recently bought an Audiofire 8, I connected AF8's word clock in to
AF12's word clock out, so AF12 is master and AF8 is slave.

Jack only uses one device at a time. How are you trying to use two with
jack? I know how it can be done with ALSA devices, but not FW devices.

> It impossible to run Jack2 at 1 ms latency as with Jack 1.

That is not true. I have used jackd2 and or jackdbus at less than 1ms with
no xruns using guitarix on an old single core P4 with 2.5G or ram. It is
possible.

--
Len Ovens
www.ovenwerks.net

[L_d_v_c@ (l-d-v-c)]

Hello Len Ovens,
Jacq can connect many soundcards in the same time.

Here 4 soundcards AudioFire 12 : http://www.linuxmao.org/tiki-view_forum_thread.php?forumId=2&comments_parentId=26984
for 48 in/out. It worked in 2010.

If Jack could run at 1 ms, so it the kernel lowlatency which couldn't.
I must compile the RT kernel.

I have found the 3.10.17 RT, but fot now, it doesn't work.
http://forum.ubuntu-fr.org/viewtopic.php?id=1416461

It's true that in 2010 and 2011 the computer ran with RT kernel.