Why the process get preempted periodically on HP z800 when NUMA is enabled ?

Solution Verified - Updated -

Issue

Why  the process get preempted periodically on HP z800 when NUMA is enabled ?.  A periodic system preemption of 20 uS is noticed.

Environment

  • Red Hat Enterprise Linux 5
  • kernel-rt 2.6.24.7-149.el5rt

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