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Window 7 as Guest OS for VDI : Max Virtual Processors Supported

June 14, 2011 Leave a comment

Looking to implement a VDI scenario with Windows 7 as the guest with a 12:1 (VP:LP) ratio ? With the launch of the SP1 for W2008R2, Microsof increased the maximum number of running virtual processors (VP) per logical processor (LP) from 8:1 to 12:1 when running Windows 7 as the guest operating system for VDI deployments

Formula : (Number of processors) * (Number of cores) * (Number of threads per core) * 12

Virtual Processor to Logical Processor² Ratio & Totals

Physical Processors	Cores per processor	Threads per core	Max Virtual Processors Supported
2	2	2	96
2	4	2	192
2	6	2	288
2	8	2	384

4	2	2	192
4	4	2	384
4	6	2	512 (576)¹
4	8	2	512 (768)¹

¹Remember that Hyper-V R2 supports up to a maximum of up to 512 virtual processors per server so while the math exceeds 512, they hit the maximum of 512 running virtual processors per server.

²A logical processor can be a core or thread depending on the physical processor.

If a core provides a single thread (a 1:1 relationship), then a logical processor = core.
If a core provides two threads per core (a 2:1 relationship), then each thread is a logical
processor.

More info :
http://technet.microsoft.com/en-us/library/ee405267%28WS.10%29.aspx
http://blogs.technet.com/b/virtualization/archive/2011/04/25/hyper-v-vm-density-vp-lp-ratio-cores-and-threads.aspx