DOS ain't dead

Detection on processor cores and hyperthreading (Announce)

posted by Laaca , Czech republic, 25.01.2021, 18:36

> > And how about systems with disabled ACPI or preACPI? You should also use
> > MPS as fallback. On some new MBs the MPS was removed...
> BTW do you really mean ACPI ID or APIC ID? There may be confusion with
> those abbrevs...

Yes, you are right. My mistake. I meant APIC_processor_ID
On preACPI systems or with disabled ACPI my utility reports - "No ACPI information - one core processor?".

For my purposes is this behaviour OK.
My Pentium 4 machine has hyperthreading technology which can be set in BIOS to be ON or OFF.

What is interresting - if I set OFF - the processor is in the ACPI/MADT table still visible but the "Flags" field is set to 0 (not ON and not capable to be ON). Such entries shall the OSes (and applications) remove from their processor cores list.

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DOS-u-akbar!

Complete thread:

• Detection on processor cores and hyperthreading - Laaca, 25.01.2021, 00:28 (Announce)
  • Detection on processor cores and hyperthreading - roytam, 25.01.2021, 06:51
  • Detection on processor cores and hyperthreading - RayeR, 25.01.2021, 13:55
    • Detection on processor cores and hyperthreading - Laaca, 25.01.2021, 15:35
      • Detection on processor cores and hyperthreading - RayeR, 25.01.2021, 17:08
        • Detection on processor cores and hyperthreading - RayeR, 25.01.2021, 17:09
          • Detection on processor cores and hyperthreading - Laaca, 25.01.2021, 18:36
            • Detection on processor cores and hyperthreading - RayeR, 26.01.2021, 03:00