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From: Michael Stone <mstone+postgres@mathom.us>
To: Greg Smith <gsmith@gregsmith.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: Benchmark: Dell/Perc 6, 8 disk RAID 10
Date: Fri, 14 Mar 2008 11:16:02 -0400
Message-ID: <20080314151600.GD2626@mathom.us> (raw)
In-Reply-To: <Pine.GSO.4.64.0803131710520.5221@westnet.com>
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	<18451.1204824562@sss.pgh.pa.us>
	<47D0AFC1.5070305@emolecules.com>
	<47D8B3B6.3010606@emolecules.com>
	<20080312225554.52f6275b@commandprompt.com>
	<47D9402A.3050903@emolecules.com>
	<Pine.GSO.4.64.0803131151430.24943@westnet.com>
	<20080313140618.3449ba58@commandprompt.com>
	<Pine.GSO.4.64.0803131710520.5221@westnet.com>

On Thu, Mar 13, 2008 at 05:27:09PM -0400, Greg Smith wrote:
>I haven't found fdatasync to be significantly better in my tests on Linux 
>but I never went out of my way to try and quantify it.  My understanding 
>is that some of the write barrier implementation details on ext3 
>filesystems make any sync call a relatively heavy operation but I haven't 
>poked at the code yet to figure out why.

Which is why having the checkpoints on a seperate ext2 partition tends 
to be a nice win. (Even if its not on a seperate disk.)

Mike Stone

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