Re: Pgsql 7.4/8.0 on IA64 HP-UX 11i?

"Ed L." <pgsql@bluepolka.net> writes:
>> I wouldn't panic.  99% of the value of a 64-bit box for database work
>> is that you can handle more than 4Gb worth of RAM for disk cache.  Since
>> in Postgres's worldview most of the disk caching is supposed to be done
>> by the kernel, it really matters not whether the Postgres executables
>> think they are 32-bit or 64-bit.  All you need is a 64-bit kernel.

> The HPUX gurus on http://forums1.itrc.hp.com testify that kernel caches
> above approximately 600MB are counter-productive to performance.

Why?  And why would you think that whatever effect is limiting the
performance would not also apply to Postgres?

            regards, tom lane