> ... as if Oracle Linux is 75% faster in comparison to relative RHEL
[5]

Think of it as a Redhat 5 userland with a Redhat 6 kernel, to a
first approximation. If they started from 2.6.32 and cherry picked
a few upstream items beyond that, they have roughly 8 years of
performance enhancements past the Redhat-5 2.6.18 era kernels to
benefit from.   They might indeed have managed 75% speedup for
some workloads.  The difference would be less impressive against
Redhat 6.2, or Fedora, or Ubuntu 10.04.

-- Jim Leinweber
State Laboratory of Hygiene, University of Wisconsin - Madison
<jim.leinwe...@slh.wisc.edu>       phone +1 608 221 6281
PGP fp: D573 AF7D F484 EE2A F0B6  B7DB A870 7518 F87D A0D1



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