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

To: xen-users <xen-users@xxxxxxxxxxxxxxxxxxx>
Subject: [Xen-users] Real CPUs (Dual Core) vs. VCPU count in HVM DomU
From: George Lenzer <George.Lenzer@xxxxxxx>
Date: Tue, 28 Aug 2007 10:47:00 -0400
Delivery-date: Thu, 30 Aug 2007 02:45:27 -0700
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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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