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SubjectRe: 2.6.0-test2-mm1 results
At some point in the past, Con Kolivas wrote:
>> 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.

On Thu, Jul 31, 2003 at 08:19:01AM -0700, Martin J. Bligh wrote:
> Well, what you want to do is prioritise interactive tasks over cpu hogs.
> What *seems* to be happening is you're just switching between cpu hogs
> more ... that doesn't help anyone really. I don't have an easy answer
> for how to fix that, but it doesn't seem desireable to me - we need some
> better way of working out what's interactive, and what's not.

I don't believe so. You're describing the precise effect of finite-
quantum FB (or tiny quantum RR) on long-running tasks. Generally
multilevel queues are used to back off to a service-time dependent
queueing discipline (e.g. use RR with increasing quanta for each level
and use level promotion and demotion to discriminate interactive tasks,
which remain higher-priority since overall policy is FB) with longer
timeslices for such beasts for less context-switching overhead. I say
lengthen timeslices with service time and make priority preemption work.

-- wli
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