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    SubjectRe: [ANNOUNCE] RSDL completely fair starvation free interactive cpu scheduler
    Date
    Con Kolivas wrote:
    > On Monday 12 March 2007 15:42, Al Boldi wrote:
    > > Con Kolivas wrote:
    > > > On Monday 12 March 2007 08:52, Con Kolivas wrote:
    > > > > And thank you! I think I know what's going on now. I think each
    > > > > rotation is followed by another rotation before the higher priority
    > > > > task is getting a look in in schedule() to even get quota and add it
    > > > > to the runqueue quota. I'll try a simple change to see if that
    > > > > helps. Patch coming up shortly.
    > > >
    > > > Can you try the following patch and see if it helps. There's also one
    > > > minor preemption logic fix in there that I'm planning on including.
    > > > Thanks!
    > >
    > > Applied on top of v0.28 mainline, and there is no difference.
    > >
    > > What's it look like on your machine?
    >
    > The higher priority one always get 6-7ms whereas the lower priority one
    > runs 6-7ms and then one larger perfectly bound expiration amount.
    > Basically exactly as I'd expect. The higher priority task gets precisely
    > RR_INTERVAL maximum latency whereas the lower priority task gets
    > RR_INTERVAL min and full expiration (according to the virtual deadline) as
    > a maximum. That's exactly how I intend it to work. Yes I realise that the
    > max latency ends up being longer intermittently on the niced task but
    > that's -in my opinion- perfectly fine as a compromise to ensure the nice 0
    > one always gets low latency.

    I think, it should be possible to spread this max expiration latency across
    the rotation, should it not?


    Thanks!

    --
    Al

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