only see cpu0 working after rebuilding kernel with SMP support

[Lei Sun]

Yes, I read that security advisory as well, and I see

-----------------------
NOTE:  For users that are certain that their environment is not affected
by this vulnerability, such as single-user systems, Hyper-Threading
Technology may be re-enabled by setting the tunable
"machdep.hyperthreading_allowed".
-----------------------

so I "echo "machdep.hyperthreading_allowed" >> /boot/load.conf", then reboot.

But still only 1 CPU is running.

Thanks in advance :)

Lei

On 7/22/05, Andreas Rudisch <"cyb."@gmx.net> wrote:
> On Fri, 2005-07-22 at 00:12 -0700, Lei Sun wrote:
> > Hi,
> > I wanted to enable the second logical CPU on my P4 HT. and...
> > Something seems to be strange to me as:
> >
> > All of the processes are running with CPU0 and none is working with CPU1
> 
> > Here is the steps and places I read and followed
> >
> > 1. I followed the custom kernel documents from
> > http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/kernelconfig-building.html
> > http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/kernelconfig-config.html
> > http://www.freebsddiary.org/smp.php
> >
> > and compiled the custom kernel
> >
> > and my kernel config:
> > -------------------------------------------------
> > ...
> > options         SMP
> > device          apic                    # I/O APIC
> > ...
> > -------------------------------------------------
> >
> > 2. Then I compiled the custom kernel, and installed it
> >
> > 3. I check the startup output, and found
> > SMP: AP CPU #1 Launched!
> >
> > So my question is, how come in top, only cpu0 is working, and no entry for cpu1?
> >
> > Thanks in advance:)
> >
> > Lei
> 
> 
> Take a look at this:
> 
> ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-05:09.htt.asc
> 
> Andreas.
> 
> --
> GnuPG key  : 0xD25FCC81  |  http://cyb.websimplex.de/pubkey.asc
> Fingerprint: D182 6F22 7EEC DD4C 0F6E  564C 691B 0372 D25F CC81
> 
> 
> 
> 
> 
> -----BEGIN PGP SIGNATURE-----
> Version: GnuPG v1.4.1 (FreeBSD)
> 
> iD8DBQBC4LgAaRsDctJfzIERAtX8AJ9fJBbODWbOxymKEFeHNpULtUrecACfYsWG
> IcmXfXCmO9ZpgCxDOlOwQWc=
> =zfk/
> -----END PGP SIGNATURE-----
> 
> 
>