Since last week I have my own Linux 64 bit machine. One of the first issues with Pd-extended on this machine was a strongly increased CPU load when audio input is temporarily shut off from parts of my patch. Subnormals! After three hours of puzzling I identified at least one offender: [cyclone/svf~].
Sorry that most of my posts to this list seem to be about subnormals. That's quite boring. But they're seriously hogging my CPU time like a swarm of grasshoppers. As I got this 64 bit machine so recently I don't know if the issue with [cyclone/svf~] exists in earlier Pd-E versions. Also, I can not understand why it happens, because the object is protected against subnormals with function PD_BIGORSMALL(). This works well on all my other systems. Moreover, it works well for other feedback delay objects like [lop~] on Linux 64 bit.
I'd like to know if anyone can confirm the issue. I was planning to do my own state variable filter anyway, but it would be nice to have a working [cyclone/svf~] as well. Check the object with attached patch if you can. To be specific, I have the issue with Pd-E 0.43.4 for Debian Squeeze amd64 from nightly builds. The i386 build is not affected.
Katja