mirror of
https://github.com/xen-project/xen.git
synced 2026-10-28 02:01:24 +01:00
Ian Campbell
bb477a1b86
This document contains several 0xa0 characters (non-breaking spaces). These do not display correctly in (some) terminals or when the document is rendered by (some) browsers. Re-encode them as spaces. I'm not confident that this change will make it through being encoded as a patch and sent through email. Its effect can be replicated with: perl -i -p -e 's/\xa0/ /g' docs/misc/sedf_scheduler_mini-HOWTO.txt [ I ran the rune rather than trying to apply the patch -iwj ] Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Committed-by: Ian Jackson <ian.jackson@eu.citrix.com>
45 lines
1.4 KiB
Plaintext
45 lines
1.4 KiB
Plaintext
sEDF scheduler
|
|
--------------
|
|
Author:
|
|
Stephan.Diestelhorst@{cl.cam.ac.uk, inf.tu-dresden.de}
|
|
|
|
Overview:
|
|
This scheduler provides weighted CPU sharing in an intuitive way and
|
|
uses realtime-algorithms to ensure time guarantees.
|
|
|
|
Usage:
|
|
-add "sched=sedf" on Xen's boot command-line
|
|
-create domains as usual
|
|
-use "xm sched-sedf <dom-id> <period> <slice> <latency-hint> <extra> <weight>"
|
|
Where:
|
|
-period/slice are the normal EDF scheduling parameters in nanosecs
|
|
-latency-hint is the scaled period in case the domain is doing heavy I/O
|
|
(unused by the currently compiled version)
|
|
-extra is a flag (0/1), which controls whether the domain can run in
|
|
extra-time
|
|
-weight is mutually exclusive with period/slice and specifies another
|
|
way of setting a domains cpu slice
|
|
|
|
Examples:
|
|
normal EDF (20ms/5ms):
|
|
xm sched-sedf <dom-id> 20000000 5000000 0 0 0
|
|
|
|
best-effort domains (i.e. non-realtime):
|
|
xm sched-sedf <dom-id> 20000000 0 0 1 0
|
|
|
|
normal EDF (20ms/5ms) + share of extra-time:
|
|
xm sched-sedf <dom-id> 20000000 5000000 0 1 0
|
|
|
|
4 domains with weights 2:3:4:2
|
|
xm sched-sedf <d1> 0 0 0 0 2
|
|
xm sched-sedf <d2> 0 0 0 0 3
|
|
xm sched-sedf <d3> 0 0 0 0 4
|
|
xm sched-sedf <d4> 0 0 0 0 2
|
|
|
|
1 fully-specified (10ms/3ms) domain, 3 other domains share
|
|
available rest in 2:7:3 ratio:
|
|
xm sched-sedf <d1> 10000000 3000000 0 0 0
|
|
xm sched-sedf <d2> 0 0 0 0 2
|
|
xm sched-sedf <d3> 0 0 0 0 7
|
|
xm sched-sedf <d4> 0 0 0 0 3
|