linux-kernel - 20% performance drop on PostgreSQL 9.2 from kernel 3.5.3 to 3.6-rc5 on AMD chipsets

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Date:	Fri, 14 Sep 2012 10:47:44 +0300
From:	Nikolay Ulyanitsky <lystor@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: 20% performance drop on PostgreSQL 9.2 from kernel 3.5.3 to 3.6-rc5
 on AMD chipsets

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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