From mboxrd@z Thu Jan 1 00:00:00 1970 From: Wendy Cheng Subject: Re: Proposal for simplifying NFS/RDMA client memory registration Date: Fri, 28 Feb 2014 14:26:37 -0800 Message-ID: References: <01C4496A-F074-4F72-9DF0-6076C05E8A1F@oracle.com> <53110287.9000400@talpey.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Return-path: In-Reply-To: Sender: linux-nfs-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Tom Talpey Cc: Chuck Lever , "linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , Linux NFS Mailing List , Shirley Ma List-Id: linux-rdma@vger.kernel.org On Fri, Feb 28, 2014 at 2:20 PM, Wendy Cheng wrote: > ni i...On Fri, Feb 28, 2014 at 1:41 PM, Tom Talpey wrote: >> >> On 2/26/2014 8:44 AM, Chuck Lever wrote: >>> >>> Hi- >>> >>> Shirley Ma and I are reviving work on the NFS/RDMA client code base in >>> the Linux kernel. So far we've built and run functional tests to determine >>> what is working and what is broken. >>> >>> [snip] > > >>> >>> ALLPHYSICAL - Usually fast, but not safe as it exposes client memory. >>> All HCAs support this mode. >> >> >> Not safe is an understatement. It exposes all of client physical >> memory to the peer, for both read and write. A simple pointer error >> on the server will silently corrupt the client. This mode was >> intended only for testing, and in experimental deployments. (sorry, resend .. previous reply bounced back due to gmail html format) Please keep "ALLPHYSICAL" for now - as our embedded system needs it. Thanks, Wendy -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: linux-nfs-owner@vger.kernel.org Received: from mail-ie0-f181.google.com ([209.85.223.181]:51916 "EHLO mail-ie0-f181.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751825AbaB1W0h (ORCPT ); Fri, 28 Feb 2014 17:26:37 -0500 MIME-Version: 1.0 In-Reply-To: References: <01C4496A-F074-4F72-9DF0-6076C05E8A1F@oracle.com> <53110287.9000400@talpey.com> Date: Fri, 28 Feb 2014 14:26:37 -0800 Message-ID: Subject: Re: Proposal for simplifying NFS/RDMA client memory registration From: Wendy Cheng To: Tom Talpey Cc: Chuck Lever , "linux-rdma@vger.kernel.org" , Linux NFS Mailing List , Shirley Ma Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-nfs-owner@vger.kernel.org List-ID: On Fri, Feb 28, 2014 at 2:20 PM, Wendy Cheng wrote: > ni i...On Fri, Feb 28, 2014 at 1:41 PM, Tom Talpey wrote: >> >> On 2/26/2014 8:44 AM, Chuck Lever wrote: >>> >>> Hi- >>> >>> Shirley Ma and I are reviving work on the NFS/RDMA client code base in >>> the Linux kernel. So far we've built and run functional tests to determine >>> what is working and what is broken. >>> >>> [snip] > > >>> >>> ALLPHYSICAL - Usually fast, but not safe as it exposes client memory. >>> All HCAs support this mode. >> >> >> Not safe is an understatement. It exposes all of client physical >> memory to the peer, for both read and write. A simple pointer error >> on the server will silently corrupt the client. This mode was >> intended only for testing, and in experimental deployments. (sorry, resend .. previous reply bounced back due to gmail html format) Please keep "ALLPHYSICAL" for now - as our embedded system needs it. Thanks, Wendy