By now you may have heard that all of MSDN and TechNet run in production (with 4 million hits per day) on a pre-release version of Hyper-V. If you are interested in the specifics of performance and architecture, read the technical article on how MSCOM Virtualizes MSDN and TechNet on Hyper-V.
For example, some perf info:
· Hyper-V CPU overhead (as measured by the parent partition utilization) was 5 to 6 percent with linear progression as the number of requests increased.
· CPU oversubscription (three four-processor VMs on an eight-processor physical server) resulted in 3 percent lower overall performance per physical server based on overall requests per second per 1 percent CPU.
· Requests per second per 1 percent CPU performance of MSDN over the previous physical server platform improved.
· Physical MSDN handled 21 percent more requests per second per 1 percent CPU than virtualized MSDN.
Note: Requests per 1 percent CPU was a primary performance benchmark for our MSDN deployment because it distilled Hyper-V's effects down to a simple, but meaningful, number for these Web sites.
The success of Hyper-V as a web platform for both MSDN and TechNet for performance and stability has given the MSCOM ops team confidence to accelerate plans to implement Hyper-V for many of the other sites, such as the live traffic testing of www.microsoft.com on Hyper-V. Costs savings forecasted from running both System Center Virtual Machine Manager (SCVMM) v2 with Hyper-V should justify the measured overhead. The lessons learned section of the paper says: