32bit vs 64 bit Linux for Oracle (was: Hardware recommendations for RedHat X86-64/10gR2)

Following on from this discussion, what is the take up on Linux 64 bit vs 32 bit for Oracle? The main reason for going with 64 bit seems to be for a large SGA, particularly the non buffer cache sections. Although large is relative; a 2Gb SGA is not considered large any more.

The reasons for staying with 32 bit seems to be perceived driver immaturity with the 64 bit versions leading to some reports of slower disk i/o.

I believe the latest versions of the proprietary *nixes (e.g. Solaris, HP) are now 64 bit.

Basically, if you are building a Linux server to run Oracle would you go with 64 or 32 bit and why?

Ray

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