linux-ext4 - Re: [Jfs-discussion] benchmark results

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Message-Id: <AAA45328-6BEA-465C-B999-C99D45FC56FF@shobe.info>
Date:	Sun, 10 Jan 2010 20:03:04 -0500
From:	Casey Allen Shobe <casey@...be.info>
To:	Larry McVoy <lm@...mover.com>
Cc:	tytso@....edu, jfs-discussion@...ts.sourceforge.net,
	linux-nilfs@...r.kernel.org,
	Christian Kujau <lists@...dbynature.de>,
	linux-ext4@...r.kernel.org,
	Peter Grandi <pg_jf2@....for.sabi.co.UK>,
	reiserfs-devel@...r.kernel.org, ext-users <ext3-users@...hat.com>,
	xfs@....sgi.com, linux-btrfs@...r.kernel.org
Subject: Re: [Jfs-discussion] benchmark results

On Dec 25, 2009, at 11:22 AM, Larry McVoy wrote:
> Dudes, sync() doesn't flush the fs cache, you have to unmount for  
> that.
> Once upon a time Linux had an ioctl() to flush the fs buffers, I used
> it in lmbench.


You do not need to unmount - 2.6.16+ have a mechanism in /proc to  
flush caches.  See http://linux-mm.org/Drop_Caches

Cheers,
-- 
Casey Allen Shobe
casey@...be.info

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