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    SubjectRe: [PATCH] sched: Fix adverse effects of NFS client on interactive response
    At 10:40 AM 1/8/2006 +1100, Peter Williams wrote:
    >Mike Galbraith wrote:
    >>> One slight variation of your scheme would be to measure the average
    >>> length of the CPU runs that the task does (i.e. how long it runs
    >>> without voluntarily relinquishing the CPU) and not allowing them to
    >>> defer the shift to the expired array if this average run length is
    >>> greater than some specified value. The length of this average for each
    >>> task shouldn't change with system load. (This is more or less saying
    >>> that it's ok for a task to stay on the active array provided it's
    >>> unlikely to delay the switch between the active and expired arrays for
    >>> very long.)
    >>Average burn time would indeed probably be a better metric, but that
    >>would require doing bookkeeping is the fast path.
    >Most of the infrastructure is already there and the cost of doing the
    >extra bits required to get this metric would be extremely small. The
    >hardest bit would be deciding on the "limit" to be applied when deciding
    >whether to let a supposed interactive task stay on the active array.

    Yeah, I noticed run_time when I started implementing my first cut. (which
    is of course buggy)

    >By the way, it seems you have your own scheduler versions? If so are you
    >interested in adding them to the collection in PlugSched?

    No, I used to do a bunch of experimentation in fairness vs interactivity,
    but they all ended up just trading one weakness for an other.


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      Last update: 2006-01-08 06:55    [W:0.031 / U:75.020 seconds]
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