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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