[ovirt-users] Guest VM Running 160 RCU Processes

[Doron Fediuck]

----- Original Message -----
> From: "Punit Dambiwal" <hypunit at gmail.com>
> To: "Doron Fediuck" <dfediuck at redhat.com>
> Sent: Wednesday, October 22, 2014 4:19:56 AM
> Subject: Re: [ovirt-users] Guest VM Running 160 RCU Processes
> 
> Hi Darrell,
> 
> I haven't open a BZ for the same...please let me know how i can open BZ ??
> 
> Doron@ yes i am referring the "MaxNumOfVmCpus"...as my host machine has 10
> CPU with HT so totally 20cpus...thats' why i modify this setting with
> MaxNumOfVmCpus=20...as
> i can not assign 160 Vcpus as my host has 20 only....
> 
> Thanks,
> Punit
> 

Punit,
did you set the HT flag in the cluster policy?
See: http://www.ovirt.org/OVirt_Administration_Guide#Optimization_Settings_Explained
You should set "Count Threads As Cores" or the engine will ignore your threads.

> On Wed, Oct 22, 2014 at 12:29 AM, Doron Fediuck <dfediuck at redhat.com> wrote:
> 
> > Hi Punit,
> > are you referring to MaxNumOfVmCpus?
> > If so I do not see how this will have an effect other than not allowing
> > you to run VMs with too many CPUs.
> >
> > ----- Original Message -----
> > > From: "Punit Dambiwal" <hypunit at gmail.com>
> > > To: "Doron Fediuck" <dfediuck at redhat.com>
> > > Sent: Tuesday, October 21, 2014 5:24:02 AM
> > > Subject: Re: [ovirt-users] Guest VM Running 160 RCU Processes
> > >
> > > Hi Doron,
> > >
> > > I solved the issue with lower down the max vcpu setting in the
> > > engine-config...
> > >
> > > Thanks,
> > > Punit
> > >
> > > On Mon, Oct 20, 2014 at 8:34 PM, Doron Fediuck <dfediuck at redhat.com>
> > wrote:
> > >
> > > >
> > > >
> > > > ----- Original Message -----
> > > > > From: "Punit Dambiwal" <hypunit at gmail.com>
> > > > > To: users at ovirt.org, "Dan Kenigsberg" <danken at redhat.com>, "Itamar
> > > > Heim" <iheim at redhat.com>, ahadas at redhat.com
> > > > > Sent: Monday, October 20, 2014 5:58:20 AM
> > > > > Subject: Re: [ovirt-users] Guest VM Running 160 RCU Processes
> > > > >
> > > > > Hi,
> > > > >
> > > > > Is there any body suggest me good way to handle it....??
> > > > >
> > > > > On Fri, Oct 17, 2014 at 3:15 PM, Punit Dambiwal < hypunit at gmail.com
> > >
> > > > wrote:
> > > > >
> > > > >
> > > > >
> > > > > Hi,
> > > > >
> > > > > I have one Ovirt cluster and under this cluster all the guest
> > machines
> > > > (such
> > > > > as centos,ubuntu,debian etc) almost 160 RCU processes running....
> > > > >
> > > > > i searched on google about the RCU (It's kernel process
> > > > "read-copy-upate")
> > > > >
> > > > > http://lwn.net/Articles/518953/
> > > > >
> > > > > I want to know how i can modify this 160 processes to 10-20 or how i
> > can
> > > > to
> > > > > disable it....is there any bed impact if i disable it....
> > > > >
> > > > > Thanks,
> > > > > Punit
> > > > >
> > > > >
> > > >
> > > > Hi Punit,
> > > > we need to do a bit of a research on this one.
> > > > In order to make sure we keep track of it, do you mind opening an RFE
> > (BZ)
> > > > with all the relevant details, including the hardware that you're
> > using,
> > > > guests config, how busy the guests/host are, Which hypervisor is used
> > and
> > > > the versions.
> > > >
> > > > Thanks,
> > > > Doron
> > > >
> > >
> >
>