[Jack-Devel] Latency issue solved
Hi everyone,
I'd been having a problem with latency recently which I've just solved
(cross fingers). The latency I was measuring through jack_iodelay was
somewhat unpredictable. It could change after rebooting the machine,
after saving settings to the firmware of my audio interface
and occasionally after xruns. This made latency correction difficult.
I solved the problem by flashing the BIOS. I hadn't done it sooner as I didn't
have a Windows partition and it was impossible to flash it from Linux.
Now the latencies seem very stable. If I loop the signal out of the audio interface
and back in again and record the input on Ardour then I see no variation at all.
Any variation in latency seems to be less than one sample!
I though it was important to send this email as I haven't see anyone write that
this sort of performance can be expected. Also I haven't seen anyone
mention recently that flashing the bios might be cure to latency ills.
For the record my audio interface is an Audio Fire 4 (firewire), my computer
is a Toshiba Satellite A100 (a dual core), I'm running a custom rt kernel,
and using the Arch Linux distro.
Cheers,
Ben
1333252249.25364_0.ltw:2,Sa <BAY169-W128F19C4E48DE263B39404DC44F0 at phx dot gbl>