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Re: [Xen-devel] fair scheduling

To: "Atsushi SAKAI" <sakaia@xxxxxxxxxxxxxx>
Subject: Re: [Xen-devel] fair scheduling
From: "pradeep singh rautela" <rautelap@xxxxxxxxx>
Date: Thu, 10 May 2007 10:58:56 +0530
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx, Harry Smith <harry.smith272@xxxxxxxxx>
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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.

Am i missing something here?


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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pradeep singh rautela

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