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xen-devel
RE: [Xen-devel] Credit scheduler anamoly
I will get the latest xen-unstable and try it again. Thanks !
Pradeep
> -----Original Message-----
> From: Emmanuel Ackaouy [mailto:ack@xxxxxxxxxxxxx]
> Sent: Wednesday, November 22, 2006 4:57 AM
> To: Padala, Pradeep
> Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [Xen-devel] Credit scheduler anamoly
>
> Are you running a xen-unstable build containing this
> changeset from November 1st?
>
> There was a bug in the cap mechanism -- found by your
> colleagues at HP -- when a physical CPU was contended. This
> changeset seems to have made things better.
>
> changeset: 12202:9a4274724794
> user: Emmanuel Ackaouy <ack@xxxxxxxxxxxxx>
> date: Wed Nov 01 19:44:34 2006 +0000
> summary: [XEN] Fix credit scheduler cap mechanism not to
> over park VCPUs
>
>
> On Tue, Nov 21, 2006 at 04:07:00PM -0600, Padala, Pradeep wrote:
> > I sent the following mail without subscribing to the list, and I am
> > not sure whether the list accepts mails from non-members. I just
> > subscribed and re-sending the mail. I apologize if you
> receive multiple copies.
> >
> > Hi,
> >
> > I am using the credit scheduler in the xen-unstable trunk and I am
> > trying to set a cap on the container CPU entitlement. I
> have two VMs
> > and two CPUs. The two VMs are restricted to one CPU using
> the command
> > xm vcpu-pin. Now, I want to cap the container CPU
> consumption say to
> > 4% and 26% of the ONE CPU.
> >
> > So, I use the following commands.
> >
> > xm sched-credit -d 73 -c 4
> > xm sched-credit -d 74 -c 26
> >
> > When I run Xentop, I see this
> >
> > apache.padalap.1 ------ 83 7.0 ...
> > apache.padalap.2 -----r 154 25.5 ...
> >
> > How is this possible when I cap the first VM to 4% ? Am I
> missing some
> > thing ? Does credit scheduler fail to enforce small caps ?
> Note that I
> > haven't changed the weights and they are set to default 256 each.
> >
> > Thanks,
> > Pradeep
> >
> > _______________________________________________
> > Xen-devel mailing list
> > Xen-devel@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-devel
>
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