Xen users - Jun 2008 - content size dependence on Dom0 CPU utilization ?

Hi,
       I am running xen3.0 on Fiesty Fawn,Ubuntu. My setup has an apache 
running on DomU and an external load generator. The content which the 
load targets is of 2 types :
1. static image : 107Kb
2. perl script : 250 bytes

*Observations:*
#1:
load : 10 requests/sec   
Static image -> Dom0 CPU utilization : 11.5%
perl script    -> Dom0 CPU utilzation :  9.5%

#2:
load : 40 requests/sec
Static image -> Dom0 CPU utilization : 21%
perl script  -> Dom0 CPU utilization : 11.8%

The activity of the backend driver of Dom0  is not supposed to be 
dependent on the content size as it deals with descriptors  (Ring 
mechanism, Ref:  Xen, Art of virtualization). But according to 
observations,  with more content size the utilization of CPU by Dom0 
increases at a higher rate which I found very surprising !! ?
                                            Any help regarding this will 
be highly appreciated.


Thanks and Regards,
Saransh Mittal.


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