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From Matt Hogstrom <>
Subject Re: Virtualization Status on Wilbur
Date Sun, 04 Mar 2007 22:34:59 GMT

On Mar 4, 2007, at 3:25 PM, Jeff Genender wrote:

> Matt Hogstrom wrote:
>> Right now I'm running SuSE Open Linux 10.2 with the Xen kernel.  I've
>> created a VM with 3G of memory and 2 CPUs (I don't currently have  
>> Intel
>> hyperthreading enabled).
>> The performance of the VM is a bit sluggish.  I had made some
>> assumptions on the performance based on the box's characteristics (4
>> 3.4Ghz dual core processors with 16MB shared L3 cache).  It has  
>> 20GB of
>> PC3200 memory.  I think those assumptions may not be valid so I'm  
>> going
>> to step backand get a baseline of native performance and then  
>> layer in
>> the Xen Kernel and finally some VMs.  I was hoping to avoid these  
>> steps
>> cause they take time.
> Look in to tuning the kernel and Xen, and th eprocessor.

Looking at that now. Thanks

> I have seen
> virtualization, when tuned, to nearly see almost no performance
> difference.  Also be sure you boot into the bios and turn on the VT
> processor extensions.  A larges % of the machines get shipped with  
> those
> turned off in the bios (I don't know why they keep em off initially).

First thing I did :)  I also disable hyperthreading for now as I'm  
thinking that Xen most likely doesn't differentiate between a  
hyperthreaded processor and a fully core.

> Jeff

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