From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from relay.sgi.com (relay3.corp.sgi.com [198.149.34.15]) by oss.sgi.com (Postfix) with ESMTP id 6184E7F50 for ; Wed, 25 Mar 2015 12:15:14 -0500 (CDT) Received: from cuda.sgi.com (cuda2.sgi.com [192.48.176.25]) by relay3.corp.sgi.com (Postfix) with ESMTP id D2A35AC001 for ; Wed, 25 Mar 2015 10:15:10 -0700 (PDT) Received: from mx141.netapp.com (mx141.netapp.com [216.240.21.12]) by cuda.sgi.com with ESMTP id Na9qHeOLuweJKS12 (version=TLSv1 cipher=RC4-SHA bits=128 verify=NO) for ; Wed, 25 Mar 2015 10:15:08 -0700 (PDT) Message-ID: <5512ED19.4060902@Netapp.com> Date: Wed, 25 Mar 2015 13:15:05 -0400 From: Anna Schumaker MIME-Version: 1.0 Subject: Re: [PATCH v3 3/3] NFSD: Add support for encoding multiple segments References: <20150318205554.GA10716@fieldses.org> <5509E824.6070006@Netapp.com> <20150318211144.GB10716@fieldses.org> <20150319153627.GA20852@fieldses.org> <20150320151718.GD2036@fieldses.org> <20150320162303.GA18786@infradead.org> <20150320182621.GH2036@fieldses.org> <20150324174916.GA28906@infradead.org> In-Reply-To: <20150324174916.GA28906@infradead.org> 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: Christoph Hellwig Cc: "J. Bruce Fields" , "linux-nfs@vger.kernel.org" , Marc Eshel , linux-nfs-owner@vger.kernel.org, xfs@oss.sgi.com On 03/24/2015 01:49 PM, Christoph Hellwig wrote: > On Tue, Mar 24, 2015 at 08:43:31AM -0400, Anna Schumaker wrote: >>> I don't know, and don't have profiles. I'll either try to reproduce or >>> wait till Anna's back from vacation. >> >> I'm using whatever functions NFSD already uses for reading files, >> which I expect go through the VFS. Is there a flag that controls >> cache behavior? > > There's the O_DIRECT flag, but that's not what I mean. If you just > wrote to it it's a cached read, if you did unmount the filesystem after > writing, or did an echo to /proc/sys/vm/drop_caches you get uncached > read behavior. Oh, I'm doing uncached reads for my tests. I'm collecting updated numbers now! Anna > _______________________________________________ xfs mailing list xfs@oss.sgi.com http://oss.sgi.com/mailman/listinfo/xfs