> We have postgres running on freebsd 4.9 with 2 Gigs of memory. As per
> repeated advice on the mailing lists we configured effective_cache_size
> = 25520 which you get by doing `sysctl -n vfs.hibufspace` / 8192
> Which results in using 200Megs for disk caching.

effective_cache_size does nothing of the sort.  CHeck your
shared_buffers value...

> Is there a reason not to increase the hibufspace beyond the 200 megs and
> provide a bigger cache to postgres? I looked both on the postgres and
> freebsd mailing lists and couldn't find a good answer to this.

Well, maybe butnot necessarily.  It's better to leave the OS to look after
most of your RAM.


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