Re: Hyperthreading in -ac series

James Cleverdon (jamesclv@us.ibm.com)
Fri, 20 Sep 2002 15:47:59 -0700

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
x440....)

-- 
James Cleverdon
IBM xSeries Linux Solutions
{jamesclv(Unix, preferred), cleverdj(Notes)} at us dot ibm dot com


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