Hi David, Here is a patch that has been floating around for a while for adding a a new hook inside timer_interrupt() so that platforms can execute a bit of their own code during the timer interrupt. This makes the hook a machvec, as you last requested. The patch is against Linus bk tree from this morning. SN2 has its own code and the machvec is a noop for all other platforms. Thanks, mh -- Martin Hicks Wild Open Source Inc. mort@wildopensource.com 613-266-2296