21 Sep
2008
21 Sep
'08
5:12 a.m.
On Sun, 21 Sep 2008 01:06:21 -0400
"Hector Centeno" <hcengar(a)gmail.com> wrote:
Hello,
I have two computers (desktop and laptop) with Ubuntu Hardy (using
kernel RT on both) and a Edirol FA-101 firewire interface. I was
comparing Jack's CPU usage (no other audio app running) using the
Edirol against a USB M-Audio Transit. I noticed on both computer the
CPU usage to be much higher with the firewire interface than with the
USB. On my laptop goes up to 15% or more and 8% on my desktop
(Centrino Duo @ 1.7GHz and Core 2 Duo @ 2.1 GHz respectively) while
using the USB interface the usage remains below 1%. Is this a normal
behaviour of firewire interfaces? Is this a Jack related issue? Is
there a recent and more efficient version of Freebob (ffado maybe?)
than the one from the Ubuntu repos?
Cheers,
Hector
Are you sure that you are comparing the same latency settings? Just
a thought because Firewire is capable of lower latencies than USB and
lower latencies also mean higher cpu usage.
As said, just a thought, I never used FW.