[Ardour-Users] Ardour uses 18% of CPU while idle ???

[Kevin Cosgrove]

On 1 January 2009 at 13:29, <nettings at stackingdwarves.net> wrote:
 
> maybe some of your plugins cause denormals in a particular combination?

I didn't know what that was, so I went looking and found this, which 
was very helpful.

http://www.digitalfishphones.com/main.php?item=2&subItem=6

I'm using GVerb, and I could see that having denormals in long 'verb tails.

> try activating ardour's denormal handling (dc bias or DAZ/FTZ if your
> cpu can do it), and see if it makes a difference.

Everything was off; load was at 20%.

Turned on DC bias, no affect (no pun).
Turned on DAZ (in addition to DC bias), no affect.
Turned on FTZ, no affect.
Turned on DAZ & FTZ, saw a couple occasional drops to 9% CPU.
Turned everything back off, load shot up to 30% and stayed there.
Turned DC bias back on, load went back down to 20%.

Sigh....

--
Kevin