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    SubjectRe: possible spinlock optimizations

    On Tue, 28 Sep 1999, Chuck Lever wrote:

    > there really isn't any reason to cut off all interrupts (on dual CPU
    > hardware) while waiting for an IRQ-masked critical section, especially if
    > you can handle an interrupt during the time you were spinning rather than
    > the time you were supposed to be running in the critical section.
    >
    > essentially you're saying that you want to be sure that the bad cases are
    > visible so we can fix them. there would still be tools to measure how
    > contended are specific spinlocks. i would prefer using such a tool since
    > it gives me empirical data, rather than waiting to experience slight
    > jerkiness in my GUI, for instance. in other words, why do we need to
    > prevent a subjective improvement to preserve a subjective indicator of
    > spinlock contention?

    well, if i had to choose between 'look, our router benchmark goes 5%
    faster' and 'look, although it makes no visible difference, it makes the
    spinlock profile look better', i sure know which i prefer :)

    (are you suggesting that increased performance as a development incentive
    does not work? Ask Andrea! :) )

    > (more time at the pub might be an acceptible answer :)

    ;)

    -- mingo





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