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

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Date:	Sun, 10 Jan 2010 17:32:51 -0800
From:	Larry McVoy <lm@...mover.com>
To:	Casey Allen Shobe <casey@...be.info>
Cc:	Larry McVoy <lm@...mover.com>, 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 Sun, Jan 10, 2010 at 08:03:04PM -0500, Casey Allen Shobe wrote:
> 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

Cool, but I tend to come at problems from a cross platform point of view.
Aix no hable /proc :)
-- 
---
Larry McVoy                lm at bitmover.com           http://www.bitkeeper.com
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