Return-Path: Received: from quartz.orcorp.ca ([184.70.90.242]:38371 "EHLO quartz.orcorp.ca" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753115AbbGTWmt (ORCPT ); Mon, 20 Jul 2015 18:42:49 -0400 Date: Mon, 20 Jul 2015 16:42:44 -0600 From: Jason Gunthorpe To: Steve Wise Cc: "'Tom Talpey'" , "'Chuck Lever'" , linux-rdma@vger.kernel.org, linux-nfs@vger.kernel.org Subject: Re: [PATCH v3 05/15] xprtrdma: Remove last ib_reg_phys_mr() call site Message-ID: <20150720224244.GB12278@obsidianresearch.com> References: <20150720185624.10997.51574.stgit@manet.1015granger.net> <20150720190311.10997.12636.stgit@manet.1015granger.net> <55AD5B48.3010906@talpey.com> <20150720210544.GA9655@obsidianresearch.com> <015101d0c331$69e31d10$3da95730$@opengridcomputing.com> <55AD7065.8040809@talpey.com> <015701d0c33d$36b53110$a41f9330$@opengridcomputing.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii In-Reply-To: <015701d0c33d$36b53110$a41f9330$@opengridcomputing.com> Sender: linux-nfs-owner@vger.kernel.org List-ID: On Mon, Jul 20, 2015 at 05:41:27PM -0500, Steve Wise wrote: > > B) why bother to check? Are machines with <4GB interesting, and worth > > supporting a special optimization? > > No, but cxgb3 is still interesting to user applications, and perhaps NFSRDMA using FRMRs. Doesn't look like the NFS client will work. It requires an all physical memory lkey for SEND and RECV buffers.. Jason