Hyperthreading <> MP. In HT, cores share the cache and the memory bus. That
could lead to poor performance under a few applications. AFAIK, HT is supported
in NetBSD, -current at least. And it's usefull if you compare the price of a HT
processor and the GLOBAL power you gain.

----- Original Message ----- 
From: "Peter Seebach" <seebs@plethora.net>
To: <port-i386@netbsd.org>
Sent: Thursday, September 18, 2003 10:24 AM
Subject: Hyperthreading?


> I know that, on some systems, a P4 with hyperthreading looks like two
> processors.  Should this be working on NetBSD-current?  Is it useful?
> I know it works in BSD/OS, and I also hear that the net performance gain
> is typically negative.  :)
>
> -s