30 Mar
2011
30 Mar
'11
1:19 p.m.
Am 28.03.2011 23:15, schrieb Dan Capp:
the file /etc/security/limits.conf should have the following lines at
its end:
@audio - rtprio 86
@audio - memlock unlimited
in Ubuntu there is a file called "audio.conf" in a folder named
/etc/security/limits.d . In Fedora the file is called 99jack.conf.
All with the same lines. You need to be member in the group "audio" (or
"jackuser" under Fedora)
Hi Peder. Thanks for your assistance. Info below:
I had a Presonus Firebox running with Frames/Periods 64/3 on a ancient
Pentium4 with zero xruns. The very same Firebox spat out xruns by the
score if running it on a Lenovo Laptop with Intel Dualcore with 256/3.
Firewire Interfaces tend to be very picky regarding the chipset oft the
FW-Controller:
http://ffado.org/?q=node/251
and they amok, if there is something on the bus blocking them.
What CPU do you have (grep "model name"
/proc/cpuinfo)?
AMD Phenom(tm) 9750 Quad-Core Processor Have you made the limits.conf hack to enable
realtime and are you
I'm afraid I have no idea. I have a real-time kernel and I have it set to on
when I use firewire, but off when I use alsa. All music production (when I
get the one-off xruns) happens only when using firewire, and thus with
realtime on.
On a system like yours any Firewire-Interface should do much better (see
above).
Ever tried a Live-DVD like AVLinux or Pure:Dyne?
running jack in realtime (with say -P70)?
Yes I have jack in realtime, on exactly P70, but ONLY in firewire mode. Alsa
mode is set to default priority and non-realtime. I have QjackCtl setup so
that it launches and starts in Alsa-mode when I boot my computer. When I do
music stuff and turn my firewire device on I switch to the "firewire" preset
which is realtime P70.
Are you running jack with ?ber-low latency;
what's the frames/period
setting?
In firewire mode I have frames/period setting of 256 with buffer on 3 = a
latency of 17.4 msec. Alsa mode is much higher on 1024 and around 70 msec
(but I believe that should be irrelevant as I don't do any audio/midi jack
connection stuff in Alsa mode.
-Dan
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