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Date:      Fri, 22 Jul 2005 11:15:50 -0700
From:      Lei Sun <lei.sun@gmail.com>
To:        Andreas Rudisch <"cyb."@gmx.net>
Cc:        freebsd-questions@freebsd.org
Subject:   Re: only see cpu0 working after rebuilding kernel with SMP support
Message-ID:  <d396fddf05072211156e8bd7f3@mail.gmail.com>
In-Reply-To: <d396fddf05072209474d9c7314@mail.gmail.com>
References:  <d396fddf05072200121b068cd9@mail.gmail.com> <1122023424.525.1.camel@p4-3200.local> <d396fddf05072209474d9c7314@mail.gmail.com>

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This thread helped

http://archives.neohapsis.com/archives/freebsd/2005-05/0037.html


On 7/22/05, Lei Sun <lei.sun@gmail.com> wrote:
> Yes, I read that security advisory as well, and I see
>=20
> -----------------------
> 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".
> -----------------------
>=20
> so I "echo "machdep.hyperthreading_allowed" >> /boot/load.conf", then reb=
oot.
>=20
> But still only 1 CPU is running.
>=20
> Thanks in advance :)
>=20
> Lei
>=20
> 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 C=
PU1
> >
> > > 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/kernelconfi=
g-building.html
> > > http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/kernelconfi=
g-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 entr=
y 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=3D
> > =3Dzfk/
> > -----END PGP SIGNATURE-----
> >
> >
> >
>



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