Re: [PATCH]: allow notsc option for buggy cpus

From: David Huggins-Daines (dhd@eradicator.org)
Date: Fri Mar 09 2001 - 21:09:47 EST

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    Alan Cox <alan@lxorguk.ukuu.org.uk> writes:

    > > My IBM Thinkpad 600E changes between 100MHz and 400MHz depending if the
    > > power is on. This means gettimeofday goes backwards if you boot with the
    >
    > Intel speedstep CPU.

    The 600E's CPU doesn't actually use SpeedStep (it's only a 400MHz
    Mobile Pentium2, SpeedStep made its debut with the 600MHz Mobile
    Pentium3), but rather some kind of external speed throttling... which
    accomplishes basically the same thing, and makes one wonder why Intel
    had to go and trademark the idea of incorporating it into the CPU.

    Toshiba laptops and probably others have been doing the same thing for
    ages now, I once had a Tecra (now sadly deceased) that would throttle
    from 133MHz to 66MHz (I think) when unplugged.

    I think this behaviour can be controlled with tpctl for the Thinkpads
    and possibly with the Toshiba utils on Toshibas... 

    -- 
David Huggins-Daines              -                     dhd@pobox.com
                      http://www.pobox.com/~dhd/
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    This archive was generated by hypermail 2b29 : Fri Mar 09 2001 - 21:14:21 EST