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xen-users
RE: [Xen-users] CPU activity: top and xm top
> -----Original Message-----
> From: Igor Chubin [mailto:igor@xxxxxxx]
> Sent: 11 April 2007 10:33
> To: Petersson, Mats
> Cc: Xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [Xen-users] CPU activity: top and xm top
>
>
> Mats,
>
> thank you for your answer.
>
>
> Now I know that domain 0 CPU activity consists of
> hypervisor activity and domain 0 kernel with its processes.
>
> You suppose that this 20% (or 14% to be more correct)
> hypervisor spends processing interrupts.
>
> But my machine is idle.
> It does nothing: it has no network activity and presumable no disk
> activity.
>
> I wanted to inspect interrupts activity using sar,
> but without success. Unfortunately sar doesn't report interrupts
> activity under Xen :(
> (May be I can use /proc/interrupts and get information from this
> file? Will it be correct?)
It should be correct as to what Dom0 is doing, it won't show interrupts
that go to Xen but are "hidden" from Dom0 (but I doubt that is many).
>
> So my machine is idle but I have 20% of CPU activity for domain 0.
> The question is: How can I get exactly know for what is this
> 20% spending?
> What tools (or interfaces e.g. /proc files) can I use for this?
Xenoprofile is probably your best bet.
--
Mats
>
>
> ...
> > > I have only domain 0 running. No U-domains at all.
> > >
> > > $ sudo xm list
> > > Name ID Mem(MiB) VCPUs State Time(s)
> > > Domain-0 0 192 2 r----- 184.0
> > >
> > > How does xm top calculate cpu activity?
> > > Is there any way to access low level information that xm
> top uses in
> > > its calculations?
> >
> > Yes there is, but I don't know how (it's been discussed
> before on Xen
> > Users and/or Xen Devel, so google should be able to find it).
> >
> > Xm top is just a python script, and you can get the
> information that the
> > python-code is fetching from the hypervisor.
> >
>
> I know this.
> But may be somebody have done this already
> and knows where this low-level information lies.
>
> Ok, I will Google for this.
>
>
> --
> WBR, i.m.chubin
>
>
>
>
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