2 Sep
2008
2 Sep
'08
6:17 a.m.
On Tue, 02 Sep 2008 08:14:02 +0200
Atte André Jensen <atte.jensen(a)gmail.com> wrote:
Hi
My old thinkpad running ubuntu 7.10 died and I'm now on a new laptop
(toshiba satellite) with ubuntu 8.04.
I'm having alot of trouble getting good realtime performance, not
sure what's caused by ubuntu or the laptop.
I installed "linux-rt" which seems to have provided some kind of
realtime kernel:
atte@vestbjerg:~$ uname -r
2.6.24-19-rt
I also edited /etc/security/limits.conf to contain:
@audio - prio 99
@audio - rtprio 99
@audio - nice -10
I can run jack with rt-priority 80, but am getting x-runs and audio
breakup even at light load and conservative latency (17ms).
One of the things I have a feeling might be causing trouble is
pulseaudio. Should this be disabled, and if so how?
What else am I missing?
NB: I'm mostly testing this with eXT2, which performed great on my
thinkpad.
NB2: This is a dualcore, 2Ghz, 2Gb ram machine with a fresh ubuntu
8.04
Any ideas appreciated
The most important piece of information when it comes to audio troubles
is missing: audio interface?
The next one: jack settings?
In case you're using you laptops on-board sound chip and it is a HDA
Intel, use periods/buffer 3.
If you do use the on-board-thing, 17ms is not conservative.
@audio - prio 99
This one is new to me. I
don't know if it hurts but it is certainly not
necessary.
What you missed are memlock settings,
there's a nice app that will allow you to set it as %, called
'Ubuntustudio Controls', and I recommend to set it to 76% (to stop
ardour from complaining).
Best Regards,
Philipp