4 Jun
2010
4 Jun
'10
8:36 p.m.
Weird, somehow my message did not make it?
Best,
Jeremy
-------- Original Message --------
Subject: Re: [LAU] xruns on ubuntu w edirol FA101
Date: Fri, 04 Jun 2010 18:06:27 +0200
From: Jeremy <jeremy(a)autostatic.com>
To: linux-audio-user(a)lists.linuxaudio.org
References: <4C092284.6090807(a)email.dk>
Atte André Jensen wrote:
Hi
A friend of mine has just installed ubuntu with a little phone support
from me. The changes we did were:
1) Add him to the audio group /etc/udev/rules.d/40-permissions.rules
2) Add the following to
KERNEL=="raw1394", GROUP="audio"
KERNEL=="dv1394*", GROUP="audio"
KERNEL=="video1394*", GROUP="audio"
3) Install a realtime kernel
However he still reports that jack exits after about 10s with buffersize
128 and he get's lots of xruns on larger buffer settings (I think even
on 1024).
This surprises me, since I run standard ubuntu (recently installed the
realtime kernel, though) with no xruns on buffersize 128 with an FA66.
Is there anything I forgot in my over-the-phone instructions? Other
ideas on how to narrow this down?
NB: I don't his computer, but according to him, it's an "old
laptop"...
Hello Atte,
First thing that pops up in my mind is CPU frequency scaling (disabling
the Ondemand service), but apparently it's an old laptop so maybe it
doesn't apply.
And Firewire can be very picky when it's an onboard Firewire chipset. If
so it could share an IRQ and then you most probably have to use rtirq to
get it running in a stable way.
Best,
Jeremy
4 Jun
4 Jun
9:18 p.m.
On 2010-06-04 20:36, Jeremy Jongepier wrote:
First thing that pops up in my mind is CPU frequency
scaling (disabling
the Ondemand service),
That might be. Again I might have falsely assumed that that goes for my
laptop (2Ghz dual core) applies to his. Still I never had problems like
the ones he has with frequency scaling. Seems to matter at high loads
but with nothing using jack it has never been a problem to me, but it's
worth a try!
but apparently it's an old laptop so maybe it
doesn't apply.
Maybe, I'm not sure exactly how old, I guess a cat /proc/cpuinfo would
be useful...
And Firewire can be very picky when it's an
onboard Firewire chipset. If
so it could share an IRQ and then you most probably have to use rtirq to
get it running in a stable way.
Ah, I didn't think about that. It could be his firewire chipset is one
of those buggy/crappy ones people curse over here from time to time.
Again I never met one of those, should have thought about that.
I used to be really into tuning my IRQ's but now it doesn't really seem
to matter anymore. Maybe that'll make a difference on his hardware.
Thanks for all the ideas so far! Seems to be lot's of stuff I forgot
about...
--
Atte
http://atte.dk http://modlys.dk
11:15 p.m.
New subject: [Fwd: Re: xruns on ubuntu w edirol FA101]
Hi,
2010/6/4 Atte André Jensen <atte(a)email.dk>dk>:
On 2010-06-04 20:36, Jeremy Jongepier wrote:
Running a FA101 here with very good results on a laptop too.
Just wanted to mention that I recall talk about some firewire chipset
that may not be too uncommon but is broken, in other oses too, when it
comes to audio. Sorry don't recall the name. Perhaps there is
something written on the ffado site.
/Robert
First thing that pops up in my mind is CPU
frequency scaling (disabling
the Ondemand service),
That might be. Again I might have falsely assumed that that goes for my
laptop (2Ghz dual core) applies to his. Still I never had problems like the
ones he has with frequency scaling. Seems to matter at high loads but with
nothing using jack it has never been a problem to me, but it's worth a try!
11:21 p.m.
New subject: [Fwd: Re: xruns on ubuntu w edirol FA101]
Robert Jonsson wrote:
Hi,
2010/6/4 Atte André Jensen <atte(a)email.dk>dk>:
Probably some Ricoh or O2 Micro chipset: http://ffado.org/?q=node/251
And I have an old Asus with a SiS Firewire chipset, that's a no go also.
Best,
Jeremy
On 2010-06-04 20:36, Jeremy Jongepier wrote:
Running a FA101 here with very good results on a laptop too.
Just wanted to mention that I recall talk about some firewire chipset
that may not be too uncommon but is broken, in other oses too, when it
comes to audio. Sorry don't recall the name. Perhaps there is
something written on the ffado site.
/Robert
First thing that pops up in my mind is CPU
frequency scaling (disabling
the Ondemand service),
That might be. Again I might have falsely assumed that that
goes for my
laptop (2Ghz dual core) applies to his. Still I never had problems like the
ones he has with frequency scaling. Seems to matter at high loads but with
nothing using jack it has never been a problem to me, but it's worth a try!
5290
days inactive
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days old
linux-audio-user@lists.linuxaudio.org
3 comments
3 participants
participants (3)
-
Atte André Jensen -
Jeremy Jongepier -
Robert Jonsson