From: Larry McVoy Subject: Re: [Jfs-discussion] benchmark results Date: Sun, 10 Jan 2010 17:32:51 -0800 Message-ID: <20100111013251.GA8233@bitmover.com> References: <19251.26403.762180.228181@tree.ty.sabi.co.uk> <20091224212756.GM21594@thunk.org> <20091225161453.GD32757@thunk.org> <20091225162238.GB19303@bitmover.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Larry McVoy , tytso@mit.edu, jfs-discussion@lists.sourceforge.net, linux-nilfs@vger.kernel.org, Christian Kujau , linux-ext4@vger.kernel.org, Peter Grandi , reiserfs-devel@vger.kernel.org, ext-users , xfs@oss.sgi.com, linux-btrfs@vger.kernel.org To: Casey Allen Shobe Return-path: Received: from ipcop.bitmover.com ([192.132.92.15]:60441 "EHLO mail.bitmover.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1750909Ab0AKBcw (ORCPT ); Sun, 10 Jan 2010 20:32:52 -0500 Content-Disposition: inline In-Reply-To: Sender: linux-ext4-owner@vger.kernel.org List-ID: 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