14 Dec
2003
14 Dec
'03
6:51 p.m.
From: hayesjaj(a)notes.udayton.edu
[mailto:hayesjaj@notes.udayton.edu]
Now that I have my card working to its fullest potential, I am
having some difficulty with xruns. Most of my projects are
rather long
recordings but I cannot seem to make ardour work for more
than 8 or so
minutes before an xrun in jack stops the transport. I have
tried the jack
startup settings from the wiki (the rme_adat ones) and have
not been able
to get them to work. I am currently using -R -t 2000 -d alsa
-d rme_adat
-r 44100 -p 256 -n8 -zs -H -M which seems to give me the
longest stretch
of recording time.
There could be any number of reasons for xruns. My first question would be, have you
applied the capabilities patch to the kernel and compiled support into jack? Are you using
a tmpfs file system for jack's FIFO? What version of jack are you using?
I would like to bump up the period length
to -p 512
but jack will not accept anything above -p 256 (64 works
though).
This card has a fixed buffer size and will only work with with the number of periods set
to 8 or 32. When using the adat device, the only combinations that will work (with 32 bit
word size) are "-p 256 -n 8" and "-p 64 and -n 32". You bump the
period length up to 512 but only if you are in 16 bit mode.
-Reuben