[Xen-users] Real CPUs (Dual Core) vs. VCPU count in HVM DomU

[George Lenzer <George.Lenzer@xxxxxxx>]

I have a server with two dual core Xeon CPUs.  So the real CPU count is 
two, but with the dual cores it's four and that's what 'top' and 'cat 
/proc/cpuinfo' reflect.  So when configuring a Xen HVM domain, should I 
set the VCPU count to 2 (equal to the number of physical processors in 
Dom0) or, should I set it to 4 (equal to the number of cores in Dom0)?  
I am currently running with VCPUs set to 2 and things seem to be working 
much better (faster) than when it was set to 4.  However, it's kind of 
weird to read /proc/cpuinfo and see two CPUs listed as dual core, but 
only have two CPUs...  The DomU HVM domain will be used for a high 
traffic groupware server (Zimbra) which means high network and disk 
I/O.  So I suspect CPU performance should be up to snuff to keep up in 
HVM.  Any ideas?
--
George Lenzer
Computer and Networking Specialist
Cleveland Public Library
Automation Department
Office: (216)623-2981


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