Re: [ovirt-users] Understand CPU Socket Cores and VCPU

[Taste-Of-IT]

Hello Michal,

and thanks for your reply. Sorry its not clear enough for me. So let me 
do some examples. Situation are still 4 Cores 8 Threads. So for a normal 
usecase i would configure 1vCPU with 1vSocket, right? But i can also 
configure 2vCPU with 1vSocket? So the vSocket is like the physical CPU 
Socket while the vCPU is like the Threads of the CPU, right? Physicaly 
1Socket has 2Threads, so i could configre 4vServer with each 2vCPU and 
1vSocket, right?

thx again
Taste

thx.
Taste

Am 2016-02-17 17:49, schrieb Michal Skrivanek:

On 17 Feb 2016, at 17:36, Taste-Of-IT  wrote:

Hello,
i have a general Question about Hardware CPU, Socket, Cores and the 
VCPU, Cores per VSocket and VScoket for virtual Machines. Example i 
have a single CPU with 4 Cores and 8 Threads. As far as i understand i 
should configure the virtual machines with that number of socket as 
the host has. So in this example with max 1 Socket. How is the 
possibility in VCPUs and VCores? What is the limit in this example? 
Can i only run max 4 VMs?


in general - as many sockets as the number of cores you have
available, minus a couple for the host OS(one or two should be ok)
you can run more, but then they will compete for the core and
performance would decrease. But if those VMs are not CPU intensive it
may very well be ok (you just need to disable the default cluster
policy which limits the size to number of hosts’s cores)

Thanks,
michal



Thanks for clarifying
Taste
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Re: [ovirt-users] Understand CPU Socket Cores and VCPU

[Michal Skrivanek]

> On 17 Feb 2016, at 17:36, Taste-Of-IT  wrote:
> 
> Hello,
> i have a general Question about Hardware CPU, Socket, Cores and the VCPU, 
> Cores per VSocket and VScoket for virtual Machines. Example i have a single 
> CPU with 4 Cores and 8 Threads. As far as i understand i should configure the 
> virtual machines with that number of socket as the host has. So in this 
> example with max 1 Socket. How is the possibility in VCPUs and VCores? What 
> is the limit in this example? Can i only run max 4 VMs?

in general - as many sockets as the number of cores you have available, minus a 
couple for the host OS(one or two should be ok)
you can run more, but then they will compete for the core and performance would 
decrease. But if those VMs are not CPU intensive it may very well be ok (you 
just need to disable the default cluster policy which limits the size to number 
of hosts’s cores)

Thanks,
michal

> 
> Thanks for clarifying
> Taste
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> Users mailing list
> Users@ovirt.org
> http://lists.ovirt.org/mailman/listinfo/users
> 
> 

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[ovirt-users] Understand CPU Socket Cores and VCPU

[Taste-Of-IT]

Hello,
i have a general Question about Hardware CPU, Socket, Cores and the 
VCPU, Cores per VSocket and VScoket for virtual Machines. Example i have 
a single CPU with 4 Cores and 8 Threads. As far as i understand i should 
configure the virtual machines with that number of socket as the host 
has. So in this example with max 1 Socket. How is the possibility in 
VCPUs and VCores? What is the limit in this example? Can i only run max 
4 VMs?


Thanks for clarifying
Taste
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