Re: [LAU] Too many xruns

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To: Kevin Cosgrove <kevinc@...>
Cc: <linux-audio-user@...>
Date: Thursday, September 6, 2012 - 4:55 pm

On Thu, September 6, 2012 8:43 am, Kevin Cosgrove wrote:

> This is looking as complicated as slackware was in 1996, back

Been there done that. This was before modules and even for a while after.

MB manufactures have not really built with audio use in mind (or perhaps
any RT use) except for the internal audio IF which you will notice has the
highest irq (which has the highest priority on an OS that doesn't have
secondary prioritizing like Linux) And that it does not share it's irq
with anything. And they are not even looking for low latency. New MBs
expect any timing critical to be in the PCIe slots... They figure the old
PCI stuff was used to slow machines ... Still a good bios may be able to
change this. Maybe take one of the slots out of PNP mode and assign a
clear or almost clear irq (may have to be in the 1-16 range) The MB may
then work around that.

I am working with a slow and cheap (did I say cheap?) netbook. By default
the internal sound IF gets an xrun/minute from wireless... turning
wireless off is worse it goes to an xrun/5seconds. I have to unload the
ath9k (I think) kernel module to get rid of that. -p 128 is the lowest
latency the internal IF will allow jack to start at. I have a USB IF (ART
dual tube pre) that can do -p 64... if it is plugged into the right usb
port and rtirq is set up right etc. If pulse is outputting to the internal
card as well as Jack sink, then the problems with the internal IF are
forced onto the external IF. That is I can no longer get jack to start at
-p 64 on the external IF.

Anyway, I have to work a bit harder to get things working the way it
should. It will run pulse->jack reliably with good latency (not sure why I
would do that) I can use it as a guitar effect with guitarix at -p64 or
128. Or even as a softsynth with more than one synth at a time. For
recording I would back the latency off to at least 1024 and monitor
externally(hardware).

Other tricks I use? I turn cron and friends off and mysql (used by
lyricue). I set performance or a least a set speed. Swappiness 10 (all the
time for this) as qjackctl seems to be one of the first things to swap out
:P

--
Len Ovens
www.OvenWerks.net

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Messages in current thread:
[LAU] Too many xruns, Kevin Cosgrove, (Wed Sep 5, 4:17 am)
Re: [LAU] Too many xruns, S. Massy, (Thu Sep 6, 1:55 pm)
Re: [LAU] Too many xruns, Kevin Cosgrove, (Thu Sep 6, 3:48 pm)
Re: [LAU] Too many xruns, Lorenzo Sutton, (Wed Sep 5, 7:50 am)
Re: [LAU] Too many xruns, Kevin Cosgrove, (Wed Sep 5, 2:43 pm)
Re: [LAU] Too many xruns, Kevin Cosgrove, (Wed Sep 5, 7:30 pm)
Re: [LAU] Too many xruns, Ralf Mardorf, (Wed Sep 5, 8:02 am)
Re: [LAU] Too many xruns, Kevin Cosgrove, (Wed Sep 5, 2:47 pm)
Re: [LAU] Too many xruns, Ralf Mardorf, (Wed Sep 5, 7:30 am)
Re: [LAU] Too many xruns, Kevin Cosgrove, (Wed Sep 5, 7:29 pm)
Re: [LAU] Too many xruns, Jeremy Jongepier, (Wed Sep 5, 7:11 am)
Re: [LAU] Too many xruns, Kevin Cosgrove, (Wed Sep 5, 7:24 pm)
Re: [LAU] Too many xruns, Kevin Cosgrove, (Thu Oct 11, 6:33 am)
Re: [LAU] Too many xruns, Paul Davis, (Thu Oct 11, 10:55 am)
Re: [LAU] Too many xruns, Kevin Cosgrove, (Thu Oct 11, 4:17 pm)
Re: [LAU] Too many xruns, Brendan Jones, (Fri Oct 12, 12:33 pm)
Re: [LAU] Too many xruns, Kevin Cosgrove, (Fri Oct 12, 4:07 pm)
Re: [LAU] Too many xruns, Brendan Jones, (Fri Oct 12, 6:55 pm)
Re: [LAU] Too many xruns, Kevin Cosgrove, (Fri Oct 12, 7:01 pm)
Re: [LAU] Too many xruns, Jeremy Jongepier, (Thu Oct 11, 6:01 pm)
Re: [LAU] Too many xruns, Kevin Cosgrove, (Thu Oct 11, 6:17 pm)
Re: [LAU] Too many xruns, Kevin Cosgrove, (Thu Oct 11, 4:50 pm)
Re: [LAU] Too many xruns, SxDx, (Thu Oct 11, 12:24 pm)
Re: [LAU] Too many xruns, R. Mattes, (Thu Oct 11, 3:45 pm)
Re: [LAU] Too many xruns, Jeremy Jongepier, (Thu Oct 11, 11:00 am)
Re: [LAU] Too many xruns, Jeremy Jongepier, (Thu Oct 11, 7:07 am)
Re: [LAU] Too many xruns, Kevin Cosgrove, (Thu Oct 11, 8:06 am)
Re: [LAU] Too many xruns, Jeremy Jongepier, (Thu Oct 11, 8:55 am)
Re: [LAU] Too many xruns, Kevin Cosgrove, (Thu Oct 11, 3:53 pm)
Re: [LAU] Too many xruns, Jeremy Jongepier, (Thu Oct 11, 5:58 pm)
Re: [LAU] Too many xruns, Len Ovens, (Thu Oct 11, 9:22 pm)
Re: [LAU] Too many xruns, Kevin Cosgrove, (Thu Oct 11, 6:03 pm)
Re: [LAU] Too many xruns, Len Ovens, (Thu Sep 6, 5:24 am)
Re: [LAU] Too many xruns, Kevin Cosgrove, (Thu Sep 6, 3:43 pm)
Re: [LAU] Too many xruns, Kevin Cosgrove, (Thu Sep 6, 5:02 pm)
Re: [LAU] Too many xruns, Joakim Hernberg, (Fri Sep 7, 8:18 am)
Re: [LAU] Too many xruns, Kevin Cosgrove, (Fri Sep 7, 8:25 pm)
Re: [LAU] Too many xruns, Jeremy Jongepier, (Fri Sep 7, 8:30 am)
Re: [LAU] Too many xruns, Joakim Hernberg, (Fri Sep 7, 9:23 am)
Re: [LAU] Too many xruns, Jeremy Jongepier, (Fri Sep 7, 9:40 am)
Re: [LAU] Too many xruns, Fernando Lopez-Lezcano, (Sat Sep 8, 6:09 pm)
Re: [LAU] Too many xruns, Joakim Hernberg, (Fri Sep 7, 10:46 am)
Re: [LAU] Too many xruns, Jeremy Jongepier, (Fri Sep 7, 11:03 am)
Re: [LAU] Too many xruns, Jeremy Jongepier, (Thu Sep 6, 7:12 pm)
Re: [LAU] Too many xruns, Len Ovens, (Thu Sep 6, 4:55 pm)
Re: [LAU] Too many xruns, Kevin Cosgrove, (Thu Sep 6, 5:08 pm)
Re: [LAU] Too many xruns, Paul Davis, (Thu Sep 6, 5:10 pm)
Re: [LAU] Too many xruns, Kevin Cosgrove, (Thu Sep 6, 5:30 pm)
Re: [LAU] Too many xruns, Ralf Mardorf, (Fri Sep 7, 2:15 am)
Re: [LAU] Too many xruns, Joakim Hernberg, (Fri Sep 7, 7:52 am)
Re: [LAU] Too many xruns, Paul Davis, (Fri Sep 7, 10:53 am)
[LAU] PCIe audio gear [was: Too many xruns], Kevin Cosgrove, (Fri Sep 7, 2:21 am)
Re: [LAU] PCIe audio gear [was: Too many xruns], Paul Davis, (Fri Sep 7, 4:02 am)
Re: [LAU] PCIe audio gear [was: Too many xruns], Len Ovens, (Fri Sep 7, 3:29 am)
Re: [LAU] PCIe audio gear [was: Too many xruns], Ralf Mardorf, (Fri Sep 7, 3:58 am)
Re: [LAU] PCIe audio gear [was: Too many xruns], Len Ovens, (Fri Sep 7, 4:47 am)
Re: [LAU] PCIe audio gear [was: Too many xruns], Kevin Cosgrove, (Fri Sep 7, 4:58 am)
Re: [LAU] PCIe audio gear [was: Too many xruns], Len Ovens, (Fri Sep 7, 1:08 pm)
Re: [LAU] PCIe audio gear [was: Too many xruns], Kevin Cosgrove, (Fri Sep 7, 8:31 pm)
Re: [LAU] PCIe audio gear [was: Too many xruns], Kevin Cosgrove, (Fri Oct 12, 5:18 pm)
Re: [LAU] PCIe audio gear [was: Too many xruns], Fernando Lopez-Lezcano, (Sat Sep 8, 6:59 pm)
Re: [LAU] PCIe audio gear [was: Too many xruns], Kevin Cosgrove, (Sun Sep 9, 4:14 pm)
Re: [LAU] PCIe audio gear [was: Too many xruns], Len Ovens, (Sat Sep 8, 9:53 pm)
Re: [LAU] PCIe audio gear [was: Too many xruns], Ralf Mardorf, (Mon Sep 10, 10:46 am)
Re: [LAU] PCIe audio gear [was: Too many xruns], Ralf Mardorf, (Fri Sep 7, 2:42 am)
Re: [LAU] Too many xruns, Jeremy Jongepier, (Thu Sep 6, 9:07 am)
Re: [LAU] Too many xruns, Len Ovens, (Thu Sep 6, 2:36 pm)
Re: [LAU] Too many xruns, Kevin Cosgrove, (Thu Sep 6, 3:50 pm)
Re: [LAU] Too many xruns, Len Ovens, (Thu Sep 6, 5:00 pm)
Re: [LAU] Too many xruns, S. Massy, (Thu Sep 6, 4:54 pm)
Re: [LAU] Too many xruns, Kevin Cosgrove, (Thu Sep 6, 5:04 pm)
Re: [LAU] Too many xruns, Rui Nuno Capela, (Thu Sep 6, 8:51 pm)
Re: [LAU] Too many xruns, Jeremy Jongepier, (Wed Sep 5, 7:42 pm)
Re: [LAU] Too many xruns, Kevin Cosgrove, (Mon Oct 1, 1:35 am)
Re: [LAU] Too many xruns, Fernando Lopez-Lezcano, (Wed Sep 5, 7:55 pm)
Re: [LAU] Too many xruns, Simon Wise, (Wed Sep 5, 5:02 am)
Re: [LAU] Too many xruns, Kevin Cosgrove, (Wed Sep 5, 2:37 pm)