memset() performance on Nehalem-EX is six times slower than the performance of Nehalem-EP.

Solution Unverified - Updated -

Issue

  • memset() performance on Nehalem-EX is six times slower than the performance of Nehalem-EP
                 CPU             real(sec)  user(sec)  sys(sec)
  --------------------------------------------------------------------------
  Server-A:  Nehalem-EP (Xeon E5503)     1.424       1.423      0.000
  Server-B:  Nehalem-EX (Xeon E7520)     8.180       8.163      0.000   Much slower!

Environment

  • Red Hat Enterprise Linux 5
  • Kernel-2.6.18-194.el5
  • glibc-2.5-49

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