Bottleneck in KVM

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Hello All

I am relatively new to kvm.
I have installed a web-server in kvm machine and pushing different request
rates on kvm through httperf. While on a bare host , i can go till 6000
request rates per second, the performance in kvm does not increase beyond
3500 request rates, i have checked CPU usage, for the different modules
and no module is getting exhausted in CPU. Enough CPUin VM remains idle in
this case.
I doubt whether i am exhausting on some buffer. Please provide details 
what could be the problem and bottlleneck in this case.

Thanks and Regards
Ankit Anand


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