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    SubjectRe: AMD64 Machine hardlocks when using memset
    Robert wrote:
    > It does run visibly slower

    The x86_64 memset(), both in user space and the kernel, for whatever gcc
    I have, and for a current kernel, uses the "repz stos" or "rep stosq"
    prefixed instruction for the bulk of the copy. This combination is a
    long running, interruptible Intel string instruction that loops on
    itself until the CX register decrements to zero.

    Was your windows app using "stos"?

    I'll wager a nickel that the actual crash you see comes when the
    processor has to handle an interrupt while in the middle of this

    I'll wager a dime it's hardware, though interrupt activity may be
    required to provoke it.

    I won't rest till it's the best ...
    Programmer, Linux Scalability
    Paul Jackson <> 1.650.933.1373, 1.925.600.0401
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      Last update: 2005-04-06 13:31    [W:0.021 / U:13.504 seconds]
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