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    SubjectRe: linux-kernel-digest V1 #113
    Steve Underwood <> said:
    > Robert Dinse wrote:


    > > Since the scheduler is adaptive, the new code, other than the
    > > test, is only going to executed under the heavy load conditions.
    > > Surely the test isn't 1kbyte or anywhere close to it?

    > A partially good point, but flawed.

    > In the reasonable load case most of the new code won't necessarily get
    > into the cache, so it should have little impact.

    But one instruction more to fetch from RAM is a _huge_ cost, relatively
    speaking. There is also the cost of making sure this whole machinery works
    right each time it is tweaked.

    > Now consider the high load case. A high load means the machine is being
    > crippled by multiple number crunching activities creating a compute
    > requirement beyond the system's reasonable means. [...]

    And this being so, no amount of tweaking will fix it. Leave it alone, that
    is simpler and has the same result: You need a a bigger machine.
    Horst von Brand
    Casilla 9G, Viña del Mar, Chile +56 32 672616

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