Index: src/backend/postmaster/autovacuum.c
===================================================================
RCS file: /home/alvherre/Code/cvs/pgsql/src/backend/postmaster/autovacuum.c,v
retrieving revision 1.47
diff -c -p -r1.47 autovacuum.c
*** src/backend/postmaster/autovacuum.c	30 May 2007 20:11:57 -0000	1.47
--- src/backend/postmaster/autovacuum.c	8 Jun 2007 14:58:19 -0000
*************** autovac_balance_cost(void)
*** 1595,1601 ****
  			int     limit = (int)
  				(cost_avail * worker->wi_cost_limit_base / cost_total);
  
! 			worker->wi_cost_limit = Min(limit, worker->wi_cost_limit_base);
  
  			elog(DEBUG2, "autovac_balance_cost(pid=%u db=%u, rel=%u, cost_limit=%d, cost_delay=%d)",
  				 worker->wi_workerpid, worker->wi_dboid,
--- 1595,1605 ----
  			int     limit = (int)
  				(cost_avail * worker->wi_cost_limit_base / cost_total);
  
! 			/*
! 			 * We put a lower bound of 1 to the cost_limit, to avoid division-
! 			 * by-zero in the vacuum code.
! 			 */
! 			worker->wi_cost_limit = Max(Min(limit, worker->wi_cost_limit_base), 1);
  
  			elog(DEBUG2, "autovac_balance_cost(pid=%u db=%u, rel=%u, cost_limit=%d, cost_delay=%d)",
  				 worker->wi_workerpid, worker->wi_dboid,