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44 lines
1.4 KiB
Plaintext
44 lines
1.4 KiB
Plaintext
sEDF scheduler
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--------------
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Author:
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Stephan.Diestelhorst@{cl.cam.ac.uk, inf.tu-dresden.de}
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Overview:
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This scheduler provides weighted CPU sharing in an intuitive way and
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uses realtime-algorithms to ensure time guarantees.
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Usage:
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-add "sched=sedf" on Xen's boot command-line
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-create domains as usual
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-use "xm sedf <dom-id> <period> <slice> <latency-hint> <extra> <weight>"
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Where:
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-period/slice are the normal EDF scheduling parameters in nanosecs
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-latency-hint is the scaled period in case the domain is doing heavy I/O
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(unused by the currently compiled version)
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-extra is a flag (0/1), which controls whether the domain can run in
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extra-time
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-weight is mutually exclusive with period/slice and specifies another
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way of setting a domains cpu slice
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Examples:
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normal EDF (20ms/5ms):
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xm sedf <dom-id> 20000000 5000000 0 0 0
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best-effort domains (i.e. non-realtime):
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xm sedf <dom-id> 20000000 0 0 1 0
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normal EDF (20ms/5ms) + share of extra-time:
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xm sedf <dom-id> 20000000 5000000 0 1 0
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4 domains with weights 2:3:4:2
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xm sedf <d1> 0 0 0 0 2
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xm sedf <d2> 0 0 0 0 3
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xm sedf <d3> 0 0 0 0 4
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xm sedf <d4> 0 0 0 0 2
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1 fully-specified (10ms/3ms) domain, 3 other domains share
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available rest in 2:7:3 ratio:
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xm sedf <d1> 10000000 3000000 0 0 0
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xm sedf <d2> 0 0 0 0 2
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xm sedf <d3> 0 0 0 0 7
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xm sedf <d4> 0 0 0 0 3 |