Operating systems (OSes) that is based on microkernel architecture have high adaptability and toughness. In addition, multicore processors have been developed along with the progress of LSI technology. By running a microkernel OS on a multicore processor and distributing the OS server to multiple cores, it is possible to realize load balancing of the OS processing. In this method, transaction processing, which requires a large amount of OS processing, can be provided effectively in a multicore environment. This paper presents evaluations of distributed OS processing performances for various scenarios for AnT operating system that is based on the microkernel architecture in a multicore environment. In these evaluations, we describe the differences in performance by distribution forms when referring the data in a block. Moreover, we use the PostMark and Bonnie benchmark tools to evaluate the effects of load balancing for the distribution forms.