Re: [Xen-devel] fair scheduling

[Atsushi SAKAI <sakaia@xxxxxxxxxxxxxx>]

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.

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...



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