PostgreSQL 7.1 (current release) - frequent errno:55 (buffer space error)

Hello,

I am running PostgreSQL on a FreeBSD machine with 1 Gig of ram, and dual
P3-733mhz CPUs. This server also runs Apache and is a production/web server.

I frequently run into the errno:55 on my site, if I simply click refresh it
goes away. Anyone have any ideas what is causing this, or how to fix it ?

my shared_buffers are set to 4000, and max_connections to 300.

I run postmaster with this command line:

./postmaster -Si -o -F -D /usr/local/pgsql/data/

Any help would be MUCH appreciated.

Thanks,

Keith Bussey
kbussey@wisol.com