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In this paper, we propose an extension to our previous MVA based methodology for estimating performance of transactions executed on multi-server systems for multicoreservers. The extension is based on the characterization of message processing service times for each server core under zero load conditions, and building an MVA model that accounts for each available core. Core utilization is characterized, as well as message routing probabilities within the multi-core machine. We illustrate the extended methodology on a prototype multi-server system.