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[Xen-users] Questions about sedf scheduler

  • To: xen-users <xen-users@xxxxxxxxxxxxxxxxxxx>
  • From: "Amitayu Das" <amitayudas@xxxxxxxxx>
  • Date: Tue, 28 Mar 2006 14:54:00 -0500
  • Delivery-date: Tue, 28 Mar 2006 19:55:52 +0000
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  • List-id: Xen user discussion <xen-users.lists.xensource.com>


Diwaker had provided a program sedf.c on Jan30 to obtain the parameters for sedf scheduler
(please check http://lists.xensource.com/archives/html/xen-users/2006-01/msg01228.html ).

In my setup, I'd two DomUs and Dom0 was running. I got the following output while running the program:

# ./sedf
Domina#0: slice = 15000000, period = 20000000, extratime = 1, latency = 0, weight = 0
Domina#18: slice = 0, period = 100000000, extratime = 1, latency = 0, weight = 0
Domina#19: slice = 0, period = 100000000, extratime = 1, latency = 0, weight = 0

I did not understand few things and would appreciate very much if someone can clarify the following doubts:

1. Why the period-length is different for Dom0 and DomU's?

2. Does period-length mean the total time within which *all* domains are supposed to be scheduled *at least once*?
    What does it mean exactly? What does slice-length mean exactly?

3. Can a domU have a slice-length as 0? If so, how can it be scheduled? I presume that value of extratime flag will make it scheduled, if set. Please clarify.

4. If extratime flag was not set, do we need to set non-zero slice-length explicitly to schedule a DomU?

Thanks in advance
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