From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from relay.sgi.com (relay1.corp.sgi.com [137.38.102.111]) by oss.sgi.com (Postfix) with ESMTP id 18ABD7F51 for ; Thu, 26 Mar 2015 11:11:37 -0500 (CDT) Received: from cuda.sgi.com (cuda3.sgi.com [192.48.176.15]) by relay1.corp.sgi.com (Postfix) with ESMTP id 04E7D8F8054 for ; Thu, 26 Mar 2015 09:11:37 -0700 (PDT) Received: from mx144.netapp.com (mx144.netapp.com [216.240.21.25]) by cuda.sgi.com with ESMTP id bUI4tW8ZSTUo8JDV (version=TLSv1 cipher=RC4-SHA bits=128 verify=NO) for ; Thu, 26 Mar 2015 09:11:35 -0700 (PDT) Message-ID: <55142FB4.2070408@Netapp.com> Date: Thu, 26 Mar 2015 12:11:32 -0400 From: Anna Schumaker MIME-Version: 1.0 Subject: Re: [PATCH v3 3/3] NFSD: Add support for encoding multiple segments References: <20150319153627.GA20852@fieldses.org> <20150320151718.GD2036@fieldses.org> <20150320162303.GA18786@infradead.org> <20150320182621.GH2036@fieldses.org> <20150324174916.GA28906@infradead.org> <55142405.3090000@Netapp.com> <20150326153848.GB30482@fieldses.org> <551429F7.5050305@Netapp.com> In-Reply-To: List-Id: XFS Filesystem from SGI List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: xfs-bounces@oss.sgi.com Sender: xfs-bounces@oss.sgi.com To: Trond Myklebust Cc: Christoph Hellwig , "linux-nfs@vger.kernel.org" , Marc Eshel , xfs@oss.sgi.com, "J. Bruce Fields" , linux-nfs-owner@vger.kernel.org On 03/26/2015 12:06 PM, Trond Myklebust wrote: > On Thu, Mar 26, 2015 at 11:47 AM, Anna Schumaker > wrote: >> On 03/26/2015 11:38 AM, J. Bruce Fields wrote: >>> On Thu, Mar 26, 2015 at 11:32:25AM -0400, Trond Myklebust wrote: >>>> On Thu, Mar 26, 2015 at 11:21 AM, Anna Schumaker >>>> wrote: >>>>> Here are my updated numbers! I tested with files 5G in size: one 100% data, one 100% hole, and one alternating between hole and data every 4K. I collected data for both v4.1 and v4.2 with and without the READ_PLUS patches: >>>>> >>>>> ########################## >>>>> # # >>>>> # Without READ_PLUS # >>>>> # # >>>>> ########################## >>>>> >>>>> >>>>> NFS v4.1: >>>>> Trial >>>>> |---------|---------|---------|---------|---------|---------|---------| >>>>> | | 1 | 2 | 3 | 4 | 5 | Average | >>>>> |---------|---------|---------|---------|---------|---------|---------| >>>>> | Data | 8.723s | 7.243s | 8.252s | 6.997s | 6.980s | 7.639s | >>>>> | Hole | 5.271s | 5.224s | 5.060s | 4.897s | 5.321s | 5.155s | >>>>> | Mixed | 8.050s | 10.057s | 7.919s | 8.060s | 9.557s | 8.729s | >>>>> |---------|---------|---------|---------|---------|---------|---------| >>>>> >>>>> >>>>> >>>>> >>>>> NFS v4.2: >>>>> Trial >>>>> |---------|---------|---------|---------|---------|---------|---------| >>>>> | | 1 | 2 | 3 | 4 | 5 | Average | >>>>> |---------|---------|---------|---------|---------|---------|---------| >>>>> | Data | 6.707s | 7.070s | 6.722s | 6.761s | 6.810s | 6.814s | >>>>> | Hole | 5.152s | 5.149s | 5.213s | 5.206s | 5.312s | 5.206s | >>>>> | Mixed | 7.979s | 7.985s | 8.177s | 7.772s | 8.280s | 8.039s | >>>>> |---------|---------|---------|---------|---------|---------|---------| >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> ####################### >>>>> # # >>>>> # With READ_PLUS # >>>>> # # >>>>> ####################### >>>>> >>>>> >>>>> NFS v4.1: >>>>> Trial >>>>> |---------|---------|---------|---------|---------|---------|---------| >>>>> | | 1 | 2 | 3 | 4 | 5 | Average | >>>>> |---------|---------|---------|---------|---------|---------|---------| >>>>> | Data | 9.082s | 7.008s | 7.116s | 6.771s | 7.902s | 7.576s | >>>>> | Hole | 5.333s | 5.358s | 5.380s | 5.161s | 5.282s | 5.303s | >>>>> | Mixed | 8.189s | 8.308s | 9.540s | 7.937s | 8.420s | 8.479s | >>>>> |---------|---------|---------|---------|---------|---------|---------| >>>>> >>>>> >>>>> >>>>> >>>>> NFS v4.2: >>>>> Trial >>>>> |---------|---------|---------|---------|---------|---------|---------| >>>>> | | 1 | 2 | 3 | 4 | 5 | Average | >>>>> |---------|---------|---------|---------|---------|---------|---------| >>>>> | Data | 7.033s | 6.829s | 7.025s | 6.873s | 7.134s | 6.979s | >>>>> | Hole | 1.794s | 1.800s | 1.905s | 1.811s | 1.725s | 1.807s | >>>>> | Mixed | 7.590s | 8.777s | 9.423s | 10.366s | 8.024s | 8.836s | >>>>> |---------|---------|---------|---------|---------|---------|---------| >>>>> >>>> >>>> So there is a clear win in the 100% hole case here, but otherwise the >>>> statistical fluctuations are dominating the numbers. Can you get us a >>>> little more stats and then perhaps run the results through nfsometer? >>> >>> Also, could you describe the setup (are these still kvm's), and how >>> you're clearing the cache between runs? >> >> These are still KVMs and my server is exporting an xfs filesystem. I clear caches by running "echo 3 > /proc/sys/vm/drop_caches" on the server before every read, and I remount my client after reading each set of three files once. > > I agree that you have to use the 'drop_caches' interface on the > server, but why not just use O_DIRECT on the clients? I've been reading by using cat from my test shell script: `time cat /nfs/file > /dev/null`. I can write something to read files with O_DIRECT if that would be more useful! Anna > _______________________________________________ xfs mailing list xfs@oss.sgi.com http://oss.sgi.com/mailman/listinfo/xfs