http://blogs.technet.com/b/virtualization/archive/2011/04/25/hyper-v-vm-density-vp-lp-ratio-cores-and-threads.aspxVirtualization Nation, With Windows Server 2008 R2 SP1 Hyper-V and Microsoft Hyper-V Server 2008 R2 SP1, we focused Hyper-V development on enhancing Virtual Desktop Infrastructure (VDI) scenarios, which resulted in the introduction of Dynamic Memoryen-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)http://blogs.technet.com/b/virtualization/archive/2011/04/25/hyper-v-vm-density-vp-lp-ratio-cores-and-threads.aspx#3474781Tue, 10 Jan 2012 19:27:01 GMTd5e57398-b9ef-4490-9955-07cbb4e4a80d:3474781Meged Ezzat<p>In real life I saw some people change number of CPU Processors per VM to be more than 4 (which is the maximum limitation) and no impact on Hyper-V performance, is this somthing that Microsoft can support?</p> <div style="clear:both;"></div><img src="http://blogs.technet.com/aggbug.aspx?PostID=3474781" width="1" height="1">http://blogs.technet.com/b/virtualization/archive/2011/04/25/hyper-v-vm-density-vp-lp-ratio-cores-and-threads.aspx#3430215Wed, 18 May 2011 22:13:12 GMTd5e57398-b9ef-4490-9955-07cbb4e4a80d:3430215bkm<p>Wow, if my 2003 servers can only use 2 virtual processors (threads) when running under Hyper-V, I am better off leaving them on my old physical boxes with real physical processors. While it is nice that MS can provide the density that they are providing, if you want any kind of basic performance then you have to stick with a physical machine. One physical core will not replace a decent 3 year old server.</p> <div style="clear:both;"></div><img src="http://blogs.technet.com/aggbug.aspx?PostID=3430215" width="1" height="1">http://blogs.technet.com/b/virtualization/archive/2011/04/25/hyper-v-vm-density-vp-lp-ratio-cores-and-threads.aspx#3425036Thu, 28 Apr 2011 21:45:48 GMTd5e57398-b9ef-4490-9955-07cbb4e4a80d:3425036JasterFab<p>2 * 6 * 2 * 8 equals 192, not 144 in table 2 row 3, doesn&#39;t it ?</p> <div style="clear:both;"></div><img src="http://blogs.technet.com/aggbug.aspx?PostID=3425036" width="1" height="1">http://blogs.technet.com/b/virtualization/archive/2011/04/25/hyper-v-vm-density-vp-lp-ratio-cores-and-threads.aspx#3424455Wed, 27 Apr 2011 00:41:31 GMTd5e57398-b9ef-4490-9955-07cbb4e4a80d:3424455Wolfgang<p>We have been told that in Windows 2008 R2 for server workloads Hyperthreading does not count, and it is 1 core = 1 logical = 8 virtual.</p> <p>Could you clarify whether it is only with Windows 2008 R2 SP1 as Hyper-V host that 1 Hyperthread = 1 Logical Processor = 8 virtual ones, or is this also with Windows 2008 and Windows 2008 R2 as hosts?</p> <div style="clear:both;"></div><img src="http://blogs.technet.com/aggbug.aspx?PostID=3424455" width="1" height="1">