From: "Darrick J. Wong" Subject: Re: [RFC v3] ext4: Combine barrier requests coming from fsync Date: Mon, 16 Aug 2010 09:14:33 -0700 Message-ID: <20100816161433.GK2109@tux1.beaverton.ibm.com> References: <20100429235102.GC15607@tux1.beaverton.ibm.com> <1272934667.2544.3.camel@mingming-laptop> <4BE02C45.6010608@redhat.com> <1273002566.3755.10.camel@mingming-laptop> <20100629205102.GM15515@tux1.beaverton.ibm.com> <20100805164008.GH2901@thunk.org> <20100805164504.GI2901@thunk.org> <20100806070424.GD2109@tux1.beaverton.ibm.com> <20100809195324.GG2109@tux1.beaverton.ibm.com> <20100809210723.GA28171@infradead.org> Reply-To: djwong@us.ibm.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: "Ted Ts'o" , Mingming Cao , Ric Wheeler , linux-ext4 , linux-kernel , Keith Mannthey , Mingming Cao To: Christoph Hellwig Return-path: Received: from e36.co.us.ibm.com ([32.97.110.154]:43423 "EHLO e36.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754474Ab0HPQPE (ORCPT ); Mon, 16 Aug 2010 12:15:04 -0400 Content-Disposition: inline In-Reply-To: <20100809210723.GA28171@infradead.org> Sender: linux-ext4-owner@vger.kernel.org List-ID: On Mon, Aug 09, 2010 at 05:07:23PM -0400, Christoph Hellwig wrote: > Can you try with the new barrier implementation in the > > [PATCH, RFC] relaxed barriers > > by making cache flushes just that and not complicated drain barrier > it should speed this case up a lot. Indeed it does! The barrier count increases to about 21000, but I also see much higher throughput, about 830 transactions per second (versus 12000 and 760 respectively before Tejun's patch). --D