On Mon, Nov 15, 2010 at 8:04 AM, Jamie Bullock <jamie@postlude.co.uk> wrote:

OK, just tried my Edirol FA-66 firewire interface. CPU does indeed drop to 12%.

Still that's a ridiculous overhead for simply talking to the audio hardware.

A profile would show that the DSP functions are no longer taking CPU time. The remaining 10% is the blocking.

Does that mean that Mathieu was wrong earlier about the PABLIO interface not causing any significant overhead?

I don't know much about PortAudio and PABLIO. The blocking call probably does come from how Pd uses PA.