VX_CONCURRENT flag on vxfs( 5.1 or later) for performance for postgresql?

From: HSIEN-WEN CHU <hsienwen(dot)chu(at)googlemail(dot)com>
To: pgsql-performance(at)postgresql(dot)org, pgsql-hackers(at)postgresql(dot)org, pgsql-novice(at)postgresql(dot)org
Subject: VX_CONCURRENT flag on vxfs( 5.1 or later) for performance for postgresql?
Date: 2011-04-28 03:33:44
Message-ID: BANLkTinBLhq8mYyeVupWz5J02OWfbTK_nA@mail.gmail.com
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Dear all

When database files are on a VxFS filesystem, performance can be
significantly improved by setting the VX_CONCURRENT cache advisory on
the file according to vxfs document,

my question is that have any tested by this?

#include <sys/fs/vx_ioctl.h>
ioctl(fd, VX_SETCACHE, VX_CONCURRENT);

Regards

HSIEN WEN

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