Am using pseudo-swap

[Jerry Whelan]

Before someone asks the obvious question, yes I am using pseudo-swap,
but 3/4 of 4GB is still nowhere near big enough to fake out the system.

[CHRIS_ANORUO]

Set nbuf and bufpages to zero
set dbc_max_pct and dbc_min_pct to their default values

[Alan Riggs]

I disagree that you should set dbc_max_pct to default value for a system with 4GB of ram. Default (at one time, at least) is 50%. This will give you 2GB maximum buffer cache which can cause serious performance degradation due not only to th edecrease in available RAM for process use but also because of the time it will take the sync command to traverse such a large buffer structure.