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    Subject20% performance drop on PostgreSQL 9.2 from kernel 3.5.3 to 3.6-rc5 on AMD chipsets
    From
    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
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