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xen-users
Re: RES: [Xen-users] XCP WinPV drivers
In that case their cpu doesn't support HT. If I recall Intel reintroduced that (server side) with the 5500 family.
As to your thoughts I've pondered the same. My company produces a student information system, and for most of our customers my department manages the servers on which the SIS is hosted. A few who are "self-hosted" have virtualized the web servers and in each case where they've had performance issues the common factor seems to be either "over subscribing" the host, or similarly, under-provisioning the individual VM's. The reason I mention this is I'm currently working with a self-hosted customer running Vmware Vsphere Esxi on 4 HP blades, each with 2 X5570 processors. Our recommendation had been to provision each web server with the equiavalent of 1-2 cores, they allocated 1 Vcpu. The X5570 is hyperthreaded, and now that I find that they're seeing average cpu utilization (of the VM's) in the 50-70% range, I go back to our recommendation. While it may be splitting hairs, IMHO by allocating only 1 Vcpu they only allocated the equivalent of 1/2 of one core.
On Mar 28, 2011, at 3:48 PM, Eduardo Kanashiro (eduardo.kanashiro) wrote: We have a similar environment running Windows 2008 R2 VM, and our host processor are Xeon E5402 quad core without HT neither turbo core, but I have experienced the same issue after install the latest versions of Xentool.
Is there any special reason for not using HT with Xen? I never had a problem, but I always ask myself if I'm giving just half CPU when I assign 1 vCPU to a VM on a system which has HT enabled.
Regards, Eduardo. |
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