Re: Hyperthreading in -ac series

From: Guido Arenstedt (
Date: Sat Sep 21 2002 - 16:54:04 EST

On Fri, 20 Sep 2002, James Cleverdon wrote:

>On Friday 20 September 2002 03:36 pm, Guido Arenstedt wrote:
>> Hyperthreading does not seem to work in the -ac series
>> it works fine with a stock 2.4.19 kernel
>> during bootup i only get the message:
>> WARNING: No sibling found for CPU 0.
>> WARNING: No sibling found for CPU 1.
>> or is this done on purpose?
>The latter. Hyperthreading _is_ working in the kernel, but it is not finding
>"sibling" CPUs to match the real ones. (Or, as we prefer to call them,
>DiVitos to match the Schwartzenegers. ;^)
>Check your BIOS. Some turn off hyperthreading by default. (Notably, IBM's

no hyperthreading is on in the bios
my problem is that hyperthreading does not work with an -ac kernel
(i have check 2.4.19-ac4 and 2.4.20-pre5-ac4)
whereas a stock kernel is working fine.

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