[PERFORM] Postgres 8.4 memory related parameters

[Claire Chang]

hi, We recently bought a 4 8core 128G memory database server and I am setting 
it up to replace our old 4 4cores 128G memory database server as a master. The 
memory related settings that we use on the old machine seem a bit wrong 
according to the experts on IRC:
max_connections = 600shared_buffers = 32GBeffective_cache_size = 64GBwork_mem = 
5MBmaintenance_work_mem = 1GB wal_buffers = 64kB
we are using ubuntu 
10/etc/sysctl.confkernel.shmmax=35433480192kernel.shmall=8650752
Can anyone suggest better values?
thanks,Claire