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    SubjectRe: What's the timeslice size for kernel 2.6.0-test2, IA32?
    Ben Greear wrote:
    >
    > Mark Mielke wrote:
    >
    >> On Fri, Aug 01, 2003 at 02:04:46PM -0230, Stephen Anthony wrote:
    >>
    >>> It would be great if sleeps were 1ms accurate instead of 10ms. It
    >>> would make synchronization code a lot easier.
    >>
    >>
    >>
    >> Doesn't this depend on what HZ you define for the kernel?
    >>
    >> If you want 1ms sleep, just set HZ to 1000HZ+, and give your process a
    >> high priority?

    As it currently stands in the 2.6 kernel for the i386, HZ is defined
    as 1000. Since the PIT interrupt source can not hit this, the actual
    timer interrupt period is 999848 nano seconds. The minimum sleep
    interval nanosleep will take is 1 of these and since the time may
    start between ticks it adds another to give a min sleep time of
    999848+~1/2 of that depending on where the request falls in the time
    period.

    --
    George Anzinger george@mvista.com
    High-res-timers: http://sourceforge.net/projects/high-res-timers/
    Preemption patch: http://www.kernel.org/pub/linux/kernel/people/rml

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