Re: 2.6.0-test2-mm1 results

From: Bill Davidsen (davidsen_at_tmr.com)
Date: 07/31/03

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    Date:	Thu, 31 Jul 2003 13:03:32 -0400 (EDT)
To: Con Kolivas <kernel@kolivas.org>

    On Fri, 1 Aug 2003, Con Kolivas wrote:

    > > Does this help interactivity a lot, or was it just an experiment?
    > > Perhaps it could be less agressive or something?
    >
    > Well basically this is a side effect of selecting out the correct cpu hogs in
    > the interactivity estimator. It seems to be working ;-) The more cpu hogs
    > they are the lower dynamic priority (higher number) they get, and the more
    > likely they are to be removed from the active array if they use up their full
    > timeslice. The scheduler in it's current form costs more to resurrect things
    > from the expired array and restart them, and the cpu hogs will have to wait
    > till other less cpu hogging tasks run.

    If that's what it really does, fine. I'm not sure it really finds hogs,
    though, or rather "finds only true hogs."

    >
    > How do we get around this? I'll be brave here and say I'm not sure we need to,
    > as cpu hogs have a knack of slowing things down for everyone, and it is best
    > not just for interactivity for this to happen, but for fairness.

    While this does a good job I'm still worried that we don't have a good
    handle on which processes are realy interactive in term of interfacing
    with a human. I don't think we can make the scheduler do the right thing
    in every case unless it has better information. 

    -- 
bill davidsen <davidsen@tmr.com>
  CTO, TMR Associates, Inc
Doing interesting things with little computers since 1979.
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  • Next message: Steve Dickson: "nfs-utils-1.0.5 is not backwards compatible with 2.4"