Am 28.03.2011 23:15, schrieb Dan Capp:
Hi Peder. Thanks for your assistance. Info below:
What CPU do you have (grep "model name" /proc/cpuinfo)?
AMD Phenom(tm) 9750 Quad-Core Processor
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.
Have you made the limits.conf hack to enable realtime and are you
I'm afraid I have no idea.
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)
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.
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.
On a system like yours any Firewire-Interface should do much better (see
above).
Ever tried a Live-DVD like AVLinux or Pure:Dyne?
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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