Re: [Xen-devel] fair scheduling

[Atsushi SAKAI <sakaia@xxxxxxxxxxxxxx>]

One vcpu can use one pcpu at one time.
It means 100% is maxium for one vcpu domain.
If you want to use cpu resources, you should set more vcpu.

Thanks
Atsushi SAKAI


"pradeep singh rautela" <rautelap@xxxxxxxxx> wrote:

> Hi Atsushi,
> 
> On 5/10/07, Atsushi SAKAI <sakaia@xxxxxxxxxxxxxx> wrote:
> >
> >
> > You should show detail configuration.
> > Your information is too short.
> >
> > Anyway I guess each domain has one vcpu.
> > If so, this is normal behavior.
> > Because one vcpu cannot allocate two or more pcpu at once.
> 
> 
> Right, but shouldn't Xen hypervisor be capable of migrating the VCPU among
> the available PCPUs on a multiprocessor system, like in this case? And
> criteria should be the load on the PCPU or the idle PCPUs.
> yes/no?
> 
> Am i missing something here?
> 
> Thanks
> ~psr
> 
> Thanks
> > Atsushi SAKAI
> >
> > "Harry Smith" <harry.smith272@xxxxxxxxx> wrote:
> >
> > > hi all,
> > >
> > > I am using xen3.0.3 on dual core hyperthreaded processor (in all 4
> > cores).
> > > There are 2 VMs vm1,vm2 among which vm1 has a webserver running on it.
> > >
> > > While testing the performance of webserver, when I introduce some load
> > on
> > > vm2 which involves some computations the webserver performance goes
> > down.
> > > This happened even in the case where CPU usage by both of vm1,vm2 is
> > > restricted to 100% each.
> > >
> > > Is it expected behavior ?  if yes then how does one can control addition
> > of
> > > new virtual machines as adding every new VM will result in lowering
> > > performance of other VMs.  Through scheduling parameters we can just
> > specify
> > > amount of CPU to be used in relative sense (weight) & upper limit (cap).
> > But
> > > how to tackle this point.
> > >
> > > I am new in this area & wanna set up a lab using virtualization, so want
> > to
> > > find solution for this.
> > >
> > > thanks,
> > > Harry
> > >
> > > we always have a choice...
> >
> >
> >
> > _______________________________________________
> > Xen-devel mailing list
> > Xen-devel@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-devel
> >
> 
> 
> 
> -- 
> ---
> pradeep singh rautela
> 
> "Genius is 1% inspiration, and 99% perspiration" - not me :)



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