Permanently disable hyperthreading
In OS X, I know you can temporarily disable hyperthreading through the Processor preference pane, as well as through the hwprefs command in Terminal. However, hyperthreading is turned back on if you resume from Sleep or reboot OS X. And worse, I cannot figure out how to disable hyperthreading if I boot into the 64-bit kernel.
Bottom line: is there a permanent way to disable hyperthreading on the 2009 Nehalem Mac Pro? On a Windows or Linux system, I know that I can disable hyperthreading in the BIOS; I'm looking for something equivalent for a Mac Pro. Thanks.
Mac Pro, iMac, MacBook, iPhone, AppleTV, several iPods, Mac OS X (10.6.1)