Hi I compiled the 3.6-rc5 kernel with the same config from 3.5.3 and got the 15-20% performance drop of PostgreSQL 9.2 on AMD chipsets (880G, 990X). CentOS 6.3 x86_64 PostgreSQL 9.2 cpufreq scaling_governor - performance # /etc/init.d/postgresql initdb # echo "fsync = off" >> /var/lib/pgsql/data/postgresql.conf # /etc/init.d/postgresql start # su - postgres $ psql # create database pgbench; # \q # pgbench -i pgbench && pgbench -c 10 -t 10000 pgbench tps = 4670.635648 (including connections establishing) tps = 4673.630345 (excluding connections establishing)[/code] On kernel 3.5.3: tps = ~5800 1) Host 1 - 15-20% performance drop AMD Phenom(tm) II X6 1090T Processor MB: AMD 880G RAM: 16 Gb DDR3 SSD: PLEXTOR PX-256M3 256Gb 2) Host 2 - 15-20% performance drop AMD Phenom(tm) II X6 1055T Processor MB: AMD 990X RAM: 32 Gb DDR3 SSD: Corsair Performance Pro 128Gb 3) Host 3 - no problems - same performance Intel E6300 MB: Intel® P43 / ICH10 RAM: 4 Gb DDR3 HDD: SATA 7200 rpm Kernel config - http://pastebin.com/cFpg5JSJ Any ideas? Thx -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
