System
------
P4 2.8Ghz 1G 1xSeagate Barracuda 40G
Linux 2.6.9 glibc 2.3.3 gcc 3.4.2
Postgresql 7.4.6 | 8.0.0RC1

Test
----
Pgbench with scale factor = 200

Pg 7.4.6
--------

clients	transactions	tps
1		1000			65.1
2		1000			72.5
4		1000			69.2
8		1000			48.3


Pg 8.0.0RC1
-----------

clients	transactions	tps		tps (new buff patch + settings)
1		1000			55.8	70.9
2		1000			68.3	77.9
4		1000			38.4	62.8
8		1000			29.4	38.1

(averages over 3 runs, database dropped and recreated after each set, with a 
checkpoint performed after each individual run)


Parameters
----------

Non default postgresql.conf parameters:

tcpip_socket = true [listen_addresses = "*"]
max_connections = 100
shared_buffers = 10000
wal_buffers = 1024	
checkpoint_segments = 10
effective_cache_size = 40000
random_page_cost = 0.8

bgwriter settings (used with patch only)

bgwriter_delay = 200  
bgwriter_percent = 2   
bgwriter_maxpages = 100