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Xeon, Hyperthreading and SMP - SCO

I have a customer with a dual Xeon 3Ghz system with OSR5.0.7 Enterprise installed. The system reports four CPUs present instead of two and he has to install four SMP licenses to (shouldn't that be three?) to make use of all "four". Is this normal behavior - to require a SMP license to make use of hyperthreading or does he need to install a patch or something. (A search of TAs turned up no mention of Xeon or hyperhtreading and the only thread in this NG suggested turning hyperthreading off in the BIOS.) Thank you, Lucky Lucky Leavell Phone: (800) ...

  1. #1

    Default Xeon, Hyperthreading and SMP

    I have a customer with a dual Xeon 3Ghz system with OSR5.0.7 Enterprise
    installed. The system reports four CPUs present instead of two and he has
    to install four SMP licenses to (shouldn't that be three?) to make use of
    all "four". Is this normal behavior - to require a SMP license to make
    use of hyperthreading or does he need to install a patch or something. (A
    search of TAs turned up no mention of Xeon or hyperhtreading and the only
    thread in this NG suggested turning hyperthreading off in the BIOS.)

    Thank you,
    Lucky

    Lucky Leavell Phone: (800) 481-2393 (US/Canada)
    UniXpress - Your Source for SCO OR: (812) 366-4066
    1560 Zoar Church Road NE FAX: (812) 366-3618
    Corydon, IN 47112-7374 Email: [email]luckyUniXpress.com[/email]
    WWW Home Page: [url]http://www.UniXpress.com[/url]

    Lucky Leavell Guest

  2. #2

    Default Re: Xeon, Hyperthreading and SMP

    Lucky Leavell wrote:
    > I have a customer with a dual Xeon 3Ghz system with OSR5.0.7 Enterprise
    > installed. The system reports four CPUs present instead of two and he has
    > to install four SMP licenses to (shouldn't that be three?) to make use of
    > all "four". Is this normal behavior - to require a SMP license to make
    > use of hyperthreading or does he need to install a patch or something. (A
    > search of TAs turned up no mention of Xeon or hyperhtreading and the only
    > thread in this NG suggested turning hyperthreading off in the BIOS.)
    OpenServer 5.0.7 Update Pack 1, coming out soon, adds support for
    HyperThreading. In particular, it makes the licensing aware of HT so
    that only one license per physical CPU is required. For your customer,
    that would be 1 base license + 1 SMP license.

    For systems without OSR507UP1 installed, the best recommendation is to
    disable HT in BIOS setup. The OS doesn't expect to see those extra CPUs
    and really has no idea what to do with them.

    Systems with a single HT CPU and OSR507UP1 can install SMP (without an
    SMP license) and take advantage of both "halves" of the CPU. My new
    workstation is configured this way...
    >Bela<
    Bela Lubkin Guest

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