Re: [Xen-devel] atropos again

[Xuehai Zhang <hai@xxxxxxxxxxxxxxx>]

> > Stephan,
> > Thanks a lot for sharing the SEDF patch. BTW, where can I find the
> > reference to use it?
>
> SEDF patch now in the public unstable tree, too! Check it out!
> There should be a mini-HOWTO, with some examples.

Thanks. I will check the unstable tree out!

>
> > Is the usage similar to Atropos (for example, "xm
> > atropos DOM PERIOD SLICE LATENCY XTRATIME")?
>
> xm sedf DOM PERIOD SLICE LATENCY XTRATIME WEIGHT
>
> Where:
> PERIOD, SLICE: times for guarantees (NANOseconds)
> LATENCY: currently ignored, recompile with other #define's in
> sched_sedf.c (ns)
> XTRATIME: flag, set to 1 and domain gets idle cpu time additional to
> it's share
> WEIGHT: use, if you don't want to specify periods/slices, simply
> distributes the cpu according to these weights
>
> Example:
>
> xm sedf 1 20000000  5000000 0 0 0
> xm sedf 2 25000000 12500000 0 0 0
>
> -dom 1 gets 25% cpu share (5 ms every 20 ms)
> -dom 2 gets 50% cpu share (12,5 ms every 25 ms)
>
> xm sedf 1 0 0 0 0 0 1
> xm sedf 2 0 0 0 0 0 5
>
> -dom 2 gets 5-times more cpu than dom 1
> -in total they get 95% - utilisation of fully specified domains

I can understand dom2 get 5 times more cpu than dom1, but why in total
they get 95%, not 94% or 96%?

Thanks.

Xuehai

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