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Date: Wed, 23 Nov 2005 04:07:07 -0500
From: Kris Kennaway <kris@obsecurity.org>
To: Kris Kennaway <kris@obsecurity.org>
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Cc: cperciva@FreeBSD.org, current@FreeBSD.org, jhb@FreeBSD.org
Subject: Re: idle task running on the wrong CPU
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On Wed, Nov 23, 2005 at 04:03:34AM -0500, Kris Kennaway wrote:
> On 6.0-STABLE:
>=20
>   PID USERNAME  THR PRI NICE   SIZE    RES STATE  C   TIME   WCPU COMMAND
>    13 root        1 171   52     0K     8K CPU1   0   0:00 100.00% idle: =
cpu1
> =20
> Note: the cpu1 idle task is running on CPU 0.  Actually it is not
> running, since it's not accumulating any CPU time, and in fact nothing
> at all is being scheduled on CPU 1.
>=20
> Kris

It was pointed out that machdep.hyperthreading_allowed=3D1 fixes this
bug (it was set to 0).  However, hyperthreading was already in use
(partly), because this machine has 2 physical CPUs with HTT, and CPUs
0, 2 and 3 were running jobs.

Looks like machdep.hyperthreading_allowed=3D0 does not work as intended.

Kris


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