Vacumm full done after each run.
pg_resetlog run between each server start

Scaling factor: 10
Initialization time: 
real    1m44.512s
user    0m1.765s
sys     0m0.134s

Kernel 2.6.0-test4
Effective cache size 38400 (300MB)
checkpoint segments=6

1)Shared buffers 1000

pgbench -c5 -t100 test1 
tps = 135.647884 (including connections establishing)
tps = 138.318785 (excluding connections establishing)

pgbench -c5 -t1000 test1
tps = 61.097461 (including connections establishing)
tps = 61.144720 (excluding connections establishing)

pgbench -c10 -t100 test1
tps = 121.626566 (including connections establishing)
tps = 123.517787 (excluding connections establishing)

pgbench -c10 -t1000 test1
tps = 54.618036 (including connections establishing)
tps = 54.654704 (excluding connections establishing)

2) Shared buffers 2000

pgbench -c5 -t100 test1
tps = 131.715307 (including connections establishing)
tps = 134.220729 (excluding connections establishing)

pgbench -c5 -t1000 test1
tps = 74.486274 (including connections establishing)
tps = 74.559177 (excluding connections establishing)

pgbench -c10 -t100 test1
tps = 127.431602 (including connections establishing)
tps = 129.461754 (excluding connections establishing)

pgbench -c10 -t1000 test1
tps = 51.840810 (including connections establishing)
tps = 51.875044 (excluding connections establishing)