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    SubjectJiffies Wraparound (was Re: interrupt counts) (fwd)
    Date
    Forwarded message:
    > From: mlord <mlord@pobox.com>
    > Newsgroups: linux.dev.kernel
    > Subject: Jiffies Wraparound (was Re: interrupt counts)
    > Date: Mon, 19 Aug 1996 21:57:35 -0400

    > Jon Lewis wrote:
    > >
    > > Just out of curiosity, what's going to happen in about 2 months when my
    > > irq 11 counter hits 4294967296? Will it happily wrap, or are things
    > > likely to get upset?
    >
    > The one that really worries me is having the "jiffies" wrap around,
    > an event which will happen every 17 months or so on production systems.
    >
    > A *lot* of the kernel will malfunction when that happens.

    Its not supposed to break anything, but I doubt it has ever been tested.
    Something that might be interesting is to compile a kernel with the counter
    pre-initialized so that it will overflow in about 5 minutes. Then some
    network connections, compilers, etc. could be started up, and we could
    see what happened when it overflowed.

    Jim

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