Re: 2.6.13-rc4: no hyperthreading and idr_remove() stack traces

On Fri, Jul 29, 2005 at 06:22:47PM -0600, Eric W. Biederman wrote:
> Andrew Morton <[email protected]> writes:
> 
> > Frank van Maarseveen <[email protected]> wrote:
> >>
> >> 2.6.13-rc4 does not recognize the second CPU of a 3GHz HT P4:
> >
> > OK, we seem to have broken your APIC code.
> 
> There is a big difference here in that one kernel is using
> the ACPI MADT tables and the other kernel is using the MP table.
> 
> I suspect the MP table on your system is incomplete while 
> your ACPI MADT does specify both logical cpus. 

MPS tables will list only physical packages. ACPI MADT tables will list
all the logical CPUs.

Frank, Please enable ACPI in your config and check if it helps.

thanks,
suresh
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References:
- 2.6.13-rc4: no hyperthreading and idr_remove() stack traces
  - From: Frank van Maarseveen <[email protected]>
- Re: 2.6.13-rc4: no hyperthreading and idr_remove() stack traces
  - From: Andrew Morton <[email protected]>
- Re: 2.6.13-rc4: no hyperthreading and idr_remove() stack traces
  - From: [email protected] (Eric W. Biederman)

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