Re: [Xen-users] Questions about sedf scheduler

[Matt Ayres <matta@xxxxxxxxxxxx>]

Just an FYI... in 3.0.2 running "xm sched-sedf domid" will show the 
parameters.  The method for setting parameters has changed also, xm help 
sched-sedf.
John Cianfarani wrote:
> Thanks for the help guys, that worked.
>
>
> John
>
> -----Original Message-----
> From: Tim Freeman [mailto:tfreeman@xxxxxxxxxxx] 
> Sent: Thursday, April 06, 2006 5:24 PM
> To: John Cianfarani
> Cc: xen-users@xxxxxxxxxxxxxxxxxxx; amitayudas@xxxxxxxxx
> Subject: Re: [Xen-users] Questions about sedf scheduler
>
> On Thu, 6 Apr 2006 16:01:38 -0400
> "John Cianfarani" <jcianfarani@xxxxxxxxxx> wrote:
>
> > How does one go about building sedf.c. I tried several gcc options but
> I
> > keep gettings errors.
> Try: 
>
> cc -lxenctrl -o sedf_dump sedf_dump.c
>
> But I think it is not working correctly now, I get slice/weight = 0 for
> all
> domains which is not right. 
>
> Tim 
>
>
> >  
> >
> > Thanks
> >
> > John
> >
> >  
> >
> > ________________________________
> >
> > From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
> > [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Amitayu
> Das
> > Sent: Tuesday, March 28, 2006 2:54 PM
> > To: xen-users
> > Subject: [Xen-users] Questions about sedf scheduler
> >
> >  
> >
> > Hi,
> >
> > 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
> > ,
> > Amitayu
>
>
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