On Thu, September 6, 2012 8:43 am, Kevin Cosgrove wrote: > On 5 September 2012 at 22:28, "Len Ovens" <len@xxxxxxxxxxxxx> wrote: > This is looking as complicated as slackware was in 1996, back > when I had to build a special kernel with each OS release. 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 _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
