Why there is High CPU usage for multithreaded workloads in RHEL 6?

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Issue

High CPU spinlock usage while running java application.
RHEL 6 scheduler doesn't scale as well as RHEL 5 scheduler for multithreaded workloads.

Environment

Red Hat Enterprise Linux 6.3
kernel-2.6.32-358.18.1.el6.x86_64

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