Date: Sat, 1 Nov 2003 14:02:44 +0100 From: "Simon L. Nielsen" <simon@FreeBSD.org> To: Helge Oldach <helge.oldach@atosorigin.com> Cc: stable@freebsd.org Subject: Re: CPU1 never used despite HTT? Message-ID: <20031101130242.GA388@arthur.nitro.dk> In-Reply-To: <200311011236.NAA21769@galaxy.hbg.de.ao-srv.com> References: <200311011236.NAA21769@galaxy.hbg.de.ao-srv.com>
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On 2003.11.01 13:36:42 +0100, Helge Oldach wrote:
> Hi,
>
> I am running a Xeon with hyperthreading support. Until last week's HTT
> modifications, according to ps(1) and top(1) both logicals CPUs were in
> use. (Processes in CPU0 and CPU1 state; "C" column showing "0" or "1".)
From UPDATING:
20031022:
Support for HyperThread logical CPUs has now been enabled by
default. As a result, the HTT kernel option no longer exists.
Instead, the logical CPUs are always started so that they can
handle interrupts. However, the extra logical CPUs are prevented
from executing user processes by default. To enable the logical
CPUs, change the value of the machdep.hlt_logical_cpus from 1 to
0. This value can also be set from the loader as a tunable of
the same name.
I would guess that's your problem.
--
Simon L. Nielsen
FreeBSD Documentation Team
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