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[libvirt] VM image running on 2 Intels

I have 2 types of hosts as below ( each is 64 bits processor . number of 
processor is not equal . First has 1G memory . the second 3 G memor):
IBM blade HS21  with Intel Xeon  L5320 (1,86Ghz) . 8 processors (blade)
IBM desktop with  Intel(R) Core(TM)2 Duo CPU     E6550  @ 2.33GHz

I have generated an Ubuntu 8.10 client image on the first . It runs smooth 
on the first via virsh  . It runs ok on the second but not well via virsh 
( define +  start <xml> ). just by a direct : sudo qemu-system-x86_64 call 

If I generate  a similar image on the second  host (using same .iso Ubuntu 
CD image)  then it runs on the first and second host smoothly via virsh 
(define + start <xml>)

Is there an explanation for that ?

Also : please comment if the below qemu-system-x86_64  explicit image 
start of a VM and the same done by a virsh command by : define + start 
            are equivalent and if not what change should I make to the 
.xml file (below)
1. sudo qemu-system-x86_64 -hda <path/to/image/file> -m 512  -net  nic, 
model=e1000 -nic tap

2. The xml file


Zvi Dubitzky 
Virtualization and System Architecture   Email:dubi il ibm com
IBM Haifa Research Laboratory    Phone: +972-4-8296182
Haifa, 31905, ISRAEL 

Attachment: vm1.xml
Description: Binary data

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