Re: [Xen-users] xend http interface

[Anand <xen.mails@xxxxxxxxx>]

Thanks Jean for all the explanation and information.

On 1/2/06, Jean-David Silberzahn <jds@xxxxxxxxxx> wrote:

Basically xen's SEDF Scheduler enables you to be certain that a given
domain has slice nanoseconds cpu during period nanoseconds. The domain
can use less cpu (if he did not need as much cpu).

Typically a domain on which you ran the command
xm sched-sedf dom-name 5000000 1000000 0 0 0 : has the right to use 1ms
of cpu every 5 ms at most, and if it need it, it is certain to have 1ms
every 5ms
xm sched-sedf dom-name 5000000 1000000 0 1 0 : dom-name can use 1ms
every 5ms at least (if domain needs to be active) and can use more if
others domain don't need the cpu

Playing with this scheduler makes you possible
- Without ExtraTime : to say that a given domain is active at least x
nanoseconds every y nanoseconds
where y is the period you specified
and x is the minimum between the slice you allow to the domain and the
time needed by the domain (not totally certain)

- With ExtraTime : to say that a given domain is active at most x
nanoseconds every y nanoseconds
where x is the minimum between the slice you allow and the time needed
by the domain

What I don't know is how this scheduler acts in smp mode (smp domU) ...

regards,

Anand
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