From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Steve Wise" Subject: RE: [PATCH] RDMA/cxgb3: fail get_dma_mr if the memory footprint can exceed 32b Date: Fri, 24 Jul 2015 09:50:03 -0500 Message-ID: <008b01d0c620$05dce480$1196ad80$@opengridcomputing.com> References: <20150722191417.9306.17387.stgit@build2.ogc.int> <55B15D7D.3090601@redhat.com> <00d501d0c599$84afdb50$8e0f91f0$@opengridcomputing.com> <55B24F65.5040103@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <55B24F65.5040103-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> Content-Language: en-us Sender: linux-rdma-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: 'Doug Ledford' Cc: linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: linux-rdma@vger.kernel.org > -----Original Message----- > From: linux-rdma-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org [mailto:linux-rdma-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org] On Behalf Of Doug Ledford > Sent: Friday, July 24, 2015 9:45 AM > To: Steve Wise > Cc: linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org > Subject: Re: [PATCH] RDMA/cxgb3: fail get_dma_mr if the memory footprint can exceed 32b > > On 07/23/2015 06:47 PM, Steve Wise wrote: > >> -----Original Message----- From: Doug Ledford > >> Should this be a static check of the pointer size versus installed > >> memory? Would it be possible to have this work for machines with > >> less than 4GB of physical memory even if they have 64bit pointers, > >> or are you concerned that hotplug memory could take us over the > >> limit after registration and cause problems? > > > > NFSRDMA doesn't need dma-mrs for T3 since it has FRMR + local dma > > lkey support. And since the deficiency really can cause problems on > > 64b systems if the memory grows > 4GB after dma-mr allocation, I > > decided to just not allow them for potential large memory systems. > > Ok. I've pulled this for 4.2-rc then. > The problem has been there since day one, so it doesn't represent a regression. It is your call, but I think 4.3 is fine. Thanks, Steve. -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html