To get VMs best performance by choosing appropriate Socket and Cores

Please advice best config to be used for my win 2003/2008/2012 VM running on Esxi 5.x
What should be count for Socket and Cores?

And For Memory how can we avoid VM ballooning and swapping
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patronTechnical consultant Asked:
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amilie wilsonCommented:
Through my point of view there is no impact on the performance whether you allocate 1 socket and 4 cores or vice-versa so don’t worrying about it.  This option is used to provide when your guest OS is not allowing to add more virtual CPU. For example server 2008 will only allow 4 physical CPU. But by increasing the no. of cores per socket you can increase no. of CPU.
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Avoid Memory Ballooning and Swapping, but increasing the memory in the HOST.

vSMP (virtual SMP) can affect virtual machine performance, when adding too many vCPUs to virtual machines that cannot use the vCPUs effectly, e.g. Servers than can use vSMP correctly :- SQL Server, Exchange Server.

This is true, many VMware Administrators, think adding lots of processors, will increase performance - wrong! (and because they can, they just go silly!). Sometimes there is confusion between cores and processors. But what we are adding is additional processors in the virtual machine.

So 4 vCPU, to the VM is a 4 Way SMP (Quad Processor Server), if you have Enterprise Plus license you can add 8, (and only if you have the correct OS License will the OS recognise them all).

If applications, can take advantage e.g. Exchange, SQL, adding additional processors, can/may increase performance.

So usual rule of thumb is try 1 vCPU, then try 2 vCPU, knock back to 1 vCPU if performance is affected. and only use vSMP if the VM can take advantage.

Example, VM with 4 vCPUs allocated!

My simple laymans explaination of the "scheduler!"

As you have assigned 4 vCPUs, to this VM, the VMware scheulder, has to wait until 4 cores are free and available, to do this, it has to pause the first cores, until the 4th is available, during this timeframe, the paused cores are not available for processes, this is my simplistic view, but bottom line is adding more vCPUs to a VM, may not give you the performance benefits you think, unless the VM, it's applications are optimised for additional vCPUs.

See here
http://www.vmware.com/resources/techresources/10131

see here
http://www.gabesvirtualworld.com/how-too-many-vcpus-can-negatively-affect-your-performance/

http://www.zdnet.com/virtual-cpus-the-overprovisioning-penalty-of-vcpu-to-pcpu-ratios-4010025185/

also there is a document here about the CPU scheduler

www.vmware.com/files/pdf/perf-vsphere-cpu_scheduler.pdf

https://blogs.vmware.com/vsphere/2013/10/does-corespersocket-affect-performance.html
compdigit44Commented:
One item I will add to the other great replies is that I it comes down to your hardware and testing to find the best fit.

For example one some of my workload I have found better performance with 4 socekts / 1 core and orther 2 sockets and 2 cores. I have also read that you do not want to allocate more vcpus to a VM that the physical process core count.. It has to do with NUMA I believe

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patronTechnical consultant Author Commented:
Thanks
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