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slow VMs on compute node


I am using OpenStack Newton release with following configuration: 1 Virtual Controller node 2 Virtual Swift nodes 2 Physical Compute Nodes (Node A: 96GB RAM , 24 CPUs [Intel(R) Xeon(R) CPU E5-2420 0 @ 1.90GHz ]; Node B: 128GB RAM, 32 CPUs [Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz])

Problem Statement:

After launching a stack of around 30 instances through Horizon, VMs get distributed to Compute Nodes A and B. To my surprise, VMs on compute A complete their cloud-config in no time (approx 300 seconds) while the same cloud-config completion time in VM on compute node B takes around 2000 seconds.

Nova-compute.conf are similar on both the Compute nodes and so are nova.conf files. What could be possible cause?

Regards AB