Hyperthreading hurts 5.3?

Bryan Fullerton fehwalker at gmail.com
Wed Jan 12 11:58:50 PST 2005

On Wed, 12 Jan 2005 18:29:01 +1300, Jonathan Chen <jonc at chen.org.nz> wrote:
> On Wed, Jan 12, 2005 at 12:02:37AM -0500, Bryan Fullerton wrote:
> > By default the system will detect a HTT processor, but can only launch
> > the second 'virtual' CPU core if you recompile the kernel with the SMP
> > option enabled.
> Not true on 5.3+ GENERIC systems. If you look at dmesg, you'll see the
> second virtual CPU launched as well as the extra column in top(1) if
> you enable HTT in the BIOS.

You are incorrect. There is no SMP option in the 5.3-R i386 GENERIC
config file as distributed.

Other platforms (sparc64 and alpha) do ship with SMP enabled by
default. They're not using HTT, though, so are irrelevant to this


More information about the freebsd-questions mailing list