The machdep.hyperthreading_allowed & ULE weirdness in 7.1

[Robert Watson]

On Mon, 23 Feb 2009, Robert Watson wrote:

> It's not quite that simple -- in a world of device drivers pinning threads to 
> CPUs for workload distribution, callout threads and sched_bind()/sched_pin() 
> for crypto load distribution, etc, you need a whole infrastructure for 
> software-disabled CPUs.  Disabling it using the BIOS or device.hints is the 
> only reliable way to do this right now.  Changing the architecture of the 
> kernel to disable CPU cores after boot is a significant investment of work,

             ^^^^ s/disable/desirable/

Robert N M Watson
Computer Laboratory
University of Cambridge