PGSTATBUFF: Warning - receive buffer full

We got a few of these on a 7.3 server this afternoon. The server was
completed pegged on i/o activity (both physical disks, including the one
the db doesn't live on)

May 12 15:15:51 gnvdb01 postgres[801]: [75] LOG:  PGSTATBUFF: Warning -
receive buffer full
May 12 15:15:52 gnvdb01 postgres[801]: [76] LOG:  PGSTATBUFF: Warning -
receive buffer full
May 12 15:15:52 gnvdb01 postgres[801]: [77] LOG:  PGSTATBUFF: Warning -
receive buffer full
May 12 15:15:52 gnvdb01 postgres[801]: [78] LOG:  PGSTATBUFF: Warning -
receive buffer full

given the archives seem to have no mention of this error, I'm just
curious as to what it actually means if its something I should be
concerned about.. ie. will it lead to problems somewhere down the line.
thanks in advance,

Robert Treat
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