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    SubjectRe: HZ, preferably as small as possible
    At 02:28 PM 10/07/2002 -0700, Andrew Morton wrote:
    > > But on the other hand, increasing HZ has perf/latency benefits, yes? Have
    > > these been quantified?
    >
    >Not that I'm aware of. And I'd regard any such claims with some
    >scepticism.

    for one, i'm using a modified version of the network FIFO queue discipline
    to inject "delay" and "drop", similar to what ippipe can do on FreeBSD.
    given i'm using a kernel timer for this, HZ >= 1000 is essential for <1.5
    millisecond accuracy.

    perhaps we really need a high-speed timer mechanism for parts of the kernel
    that require it (or a highly-accurate single-fire timer)?


    cheers,

    lincoln.

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