shared_buffers/effective_cache_size on 96GB server

Hi everyone,

I have a Postgresql 9.1 dedicated server with 16 cores, 96GB RAM and RAID10 15K SCSI drives which is runing Centos 6.2 x64. This server is mainly used for inserting/updating large amounts of data via copy/insert/update commands, and seldom for running select queries.

Here are the relevant configuration parameters I changed:

shared_buffers = 10GB
effective_cache_size = 90GB
work_mem = 32MB
maintenance_work_mem = 512MB
checkpoint_segments = 64
checkpoint_completion_target = 0.8

My biggest concern are shared_buffers and effective_cache_size, should I increase shared_buffers and decrease effective_cache_size? I read that values above 10GB for shared_buffers give lower performance, than smaller amounts?

free is currently reporting (during the loading of data):

$ free -m
             total       used       free     shared    buffers     cached
Mem:         96730      96418        311          0         71      93120
-/+ buffers/cache:       3227      93502
Swap:        21000         51      20949

So it did a little swapping, but only minor, still I should probably decrease shared_buffers so there is no swapping at all.

Thanks in advance,
Strahinja