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xen-users
Re: [Xen-users] SEDF and latency parameter
Timo Benk wrote:
Hi,
can someone explain or point me to some doku where the latency parameter
for the SEDF Parameter is explained?
Greetings,
-timo
Hi Timo,
Suse 10. is accompanied by some interesting xen doku stuff. See
/usr/share/doc/xen.
Here is the supplied documentation on sedf which contains info on the
latency parameter which will hopefully helpful to you.
If - and how - it works please let us know (have no experience with this
so far)
<quote>
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
</quote>
Cheers,
Andrej
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