hyper threading.

[em1897 at aol.com]

This is the kind of disinformation I have been
referring to....

You'll get much better performance with 1 processor in
UP mode. I suggest you do some testing.

-----Original Message-----
From: Anthony Atkielski <atkielski.anthony at wanadoo.fr>
To: freebsd-questions at freebsd.org
Sent: Sat, 26 Mar 2005 19:28:11 +0100
Subject: Re: hyper threading.

Perttu Laine writes:

> I have 3,4ghz ht processor and freebsd shows up only one processors. I
> suppose it should show two in ht models? so, GENERIC kernel doesn't
> support it? but should I add to kernel config to enable it? by reading
> config examples I think this should be enough:
>
> options   SMP

Yes, that's all you need.  Just add that line, rebuild and reinstall the
kernel, and you're all set.  Works great.  Hyperthreading doesn't buy
you as much as truly separate processors, but it helps you get more bang
for the buck out of your single processor (depending on the type of
workload you run).