linux-kernel - Lmbench performance drop 2.6.18-->2.6.27

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Message-ID: <90f56e480911191313n1050831ft4369ab5fcb937c01@mail.gmail.com>
Date:	Thu, 19 Nov 2009 13:13:19 -0800
From:	Ajay Patel <patela@...il.com>
To:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Lmbench performance drop 2.6.18-->2.6.27

Hi all,

Part of our evaluation to upgrade kernel we
ran lmbench. The lmbench results shows significant performance
drop from 2.6.18 to 2.6.27. (Results attached)

The benchmark was performed on same hardware with
different distro. (Quad-Core AMD Opteron(tm) Processor 2346 HE,
cpu MHz : 1795.597, cache size : 512 KB, x86_64 kernel)

The 2.6.18 based distribution was from CentOS release 5.4.
(Linux cento-5.4 2.6.18-164.el5).
The 2.6.27 based distribution was from FC10.
(Fedora Core release 10 2.6.27.5-117.fc10-x86_64).

Does this results make sense?  Is this expected?
Am I doing something wrong?

Thanks
Ajay

View attachment "lmbench-amd-distro.txt" of type "text/plain" (8445 bytes)