2 Sep
2008
2 Sep
'08
4:14 a.m.
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
--
Atte
http://atte.dk http://modlys.dk
2 Sep
2 Sep
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
6:34 a.m.
Atte André Jensen wrote:
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 a lot 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?
Don't know how, but you certainly don't need PulseAudio since you're
using JACK. How about just uninstalling it? Oh, someone on the list
posted an email in the last day or so explaining how to disable
PulseAudio. You might find that in the archives. A Google search found a
recommendation to uninstall the packages kde-settings-pulseaudio and
alsa-plugins-pulseaudio.
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
I have a Toshiba Satellite. You may find that the built-in Intel video
contributes a lot to xruns - and I'm not sure what you can do about it.
Oh, and if you're not using the wireless connection, make sure to
disable it, or the silly wireless driver will keep right on checking for
a wireless signal, even if the external antenna switch is off.
--
David
gnome(a)hawaii.rr.com
authenticity, honesty, community
6:58 a.m.
Quoth david at 2008-09-02 18:04...
I have a Toshiba Satellite. You may find that the
built-in Intel video
contributes a lot to xruns - and I'm not sure what you can do about it.
I disabled the kernel module for my ThinkPad video card - the system
still seems to work find, but I no longer have the driver hogging that
interrupt.
Whilst that didn't completely stop my xrun problem, disabling the
onboard Intel HD soundcard did.
From what I was told when investigating my problem, the Intel HD audio
drivers (snd_hda_intel) can cause problems.
I use an external USB soundcard - the Behringer UCA202. These are quite
inexpensive and have the added benefit of having RCA connectors rather
than those horrible little 3.5mm jacks for the main in/out connections.
Hope this helps.
Cheers
M
--
Matthew Smith
Smiffytech - Technology Consulting & Web Application Development
Business: http://www.smiffytech.com/
Personal: http://www.smiffysplace.com/
LinkedIn: http://www.linkedin.com/in/smiffy
3 Sep
3 Sep
1:33 p.m.
Matthew Smith wrote:
From what I was told when investigating my problem,
the Intel HD audio
drivers (snd_hda_intel) can cause problems.
I see.
I use an external USB soundcard - the Behringer
UCA202. These are quite
inexpensive and have the added benefit of having RCA connectors rather
than those horrible little 3.5mm jacks for the main in/out connections.
I tried my edirol usb soundcard, and that seemsto run glitch-free at
17ms (but no lower). Is that as low as usb goes or should I be able to
improve that?
--
Atte
http://atte.dk http://modlys.dk
4:45 p.m.
Hallo,
Atte André Jensen hat gesagt: // Atte André Jensen wrote:
I tried my edirol usb soundcard, and that seemsto run
glitch-free at
17ms (but no lower). Is that as low as usb goes or should I be able to
improve that?
Latency relies on various things (rt-kernel etc.) but for USB cards,
you can do additional tuning:
http://alsa.opensrc.org/index.php/Usb-audio#Tuning_USB_devices_for_minimal_…
(one line URL)
Ciao
--
Frank Barknecht _ ______footils.org__
7:53 p.m.
On Wed, 03 Sep 2008 17:33:50 +0200
Atte André Jensen <atte.jensen(a)gmail.com> wrote:
Matthew Smith wrote:
Hi,
I use an edirol UA-25, and it can go lower, however, USB is rather
limited. I don't use it below 128 frames/period (~8ms).
64 frames/period (~4ms)seems to be the lowest working setting but I
don't recommend it. All values as reported by qjackctl, so it's
'roundtrip-latency' I guess.
Best Regards
Philipp
From what I was told when investigating my
problem, the Intel HD
audio drivers (snd_hda_intel) can cause problems.
I see.
I use an external USB soundcard - the Behringer
UCA202. These are
quite inexpensive and have the added benefit of having RCA
connectors rather than those horrible little 3.5mm jacks for the
main in/out connections.
I tried my edirol usb soundcard, and that seemsto run glitch-free at
17ms (but no lower). Is that as low as usb goes or should I be able
to improve that?
5 Sep
5 Sep
4:15 a.m.
Hallo,
hollunder(a)gmx.at hat gesagt: // hollunder(a)gmx.at wrote:
I use an edirol UA-25, and it can go lower, however,
USB is rather
limited. I don't use it below 128 frames/period (~8ms).
64 frames/period (~4ms)seems to be the lowest working setting but I
don't recommend it. All values as reported by qjackctl, so it's
'roundtrip-latency' I guess.
With nrpacks=1 I could also run 32 frames, but it is rather unstable
and CPU intensive.
Ciao
--
Frank Barknecht _ ______footils.org__
5724
days inactive
5727
days old
linux-audio-user@lists.linuxaudio.org
7 comments
5 participants
participants (5)
-
Atte André Jensen -
david -
Frank Barknecht -
hollunder＠gmx.at -
Matthew Smith