WRT 64-bit and Postgres, it depends on the CPU as to whether you see a
simple performance benefit.  On the Opteron you will see a benefit when
doing CPU bound work.  When doing the CPU portion, the additional registers
of the Opteron running in 64-bit mode are used by the compiler to produce a
20-30% boost in performance.  On the Xeon in 64-bit mode, the same regions
of execution will slow down by about 5%.

Is that true of even Woodcrest?

Joshua D. Drake

Postgres benefits automatically from the larger memory addressing of the
64-bit kernel by using the larger I/O cache of Linux.

- Luke

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