Re: [storm] I-D Action: draft-ietf-storm-rdmap-ext-01.txt
Tom Talpey <ttalpey@microsoft.com> Tue, 13 September 2011 15:19 UTC
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From: Tom Talpey <ttalpey@microsoft.com>
To: "david.black@emc.com" <david.black@emc.com>, "storm@ietf.org" <storm@ietf.org>
Thread-Topic: [storm] I-D Action: draft-ietf-storm-rdmap-ext-01.txt
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Date: Tue, 13 Sep 2011 15:21:02 +0000
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Subject: Re: [storm] I-D Action: draft-ietf-storm-rdmap-ext-01.txt
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Ok, agreed the document needs to make such a statement, and "natural alignment" is not sufficient especially when considered end-to-end. Tom. -----Original Message----- From: david.black@emc.com [mailto:david.black@emc.com] Sent: Tuesday, September 13, 2011 10:50 AM To: Tom Talpey; storm@ietf.org Subject: RE: [storm] I-D Action: draft-ietf-storm-rdmap-ext-01.txt Restating my concern: If an alignment violation causes an error in this protocol, then this protocol must specify how to avoid causing an alignment violation. Thanks, --David > -----Original Message----- > From: Tom Talpey [mailto:ttalpey@microsoft.com] > Sent: Tuesday, September 13, 2011 8:22 AM > To: Black, David; storm@ietf.org > Subject: RE: [storm] I-D Action: draft-ietf-storm-rdmap-ext-01.txt > > Actually, this question goes deeper - alignment requirements such as > this are actually on the *application*. Are we requiring that they > align their atomics? Is 64-bits always enough to ensure correctness? > Also remember the peer performs no processing, it simply issues an operation to an application-provided value (the atomic's RDMA triplet). > > Normally such a requirement would be specified in the Verbs. Since > local behavior is not in scope here, perhaps the document should make > no requirement at all, and simply give some advice. The mechanism to avoid it is necessarily at the upper layer. > > Tom. > > -----Original Message----- > From: storm-bounces@ietf.org [mailto:storm-bounces@ietf.org] On Behalf > Of david.black@emc.com > Sent: Monday, September 12, 2011 2:12 PM > To: storm@ietf.org > Subject: Re: [storm] I-D Action: draft-ietf-storm-rdmap-ext-01.txt > > In looking at the changes in this draft from the -00 version, I > noticed something that needs attention, although it was already present in the -00 version: > > The term "naturally aligned" needs to be defined for buffer addresses, > because failure to use a "naturally aligned" buffer address causes a > "Catastrophic Error" at the recipient. For this reason, there needs to be a tight specification of what the sender needs to do to avoid that error. > Specifying a boundary that is always "naturally aligned" (e.g., > 64-bit) should suffice (and is probably superior to providing a way to figure this out on-the-wire). > > Thanks, > --David > > > -----Original Message----- > > From: storm-bounces@ietf.org [mailto:storm-bounces@ietf.org] On > > Behalf Of internet-drafts@ietf.org > > Sent: Monday, July 11, 2011 4:17 PM > > To: i-d-announce@ietf.org > > Cc: storm@ietf.org > > Subject: [storm] I-D Action: draft-ietf-storm-rdmap-ext-01.txt > > > > A New Internet-Draft is available from the on-line Internet-Drafts > > directories. This draft is a work item of the STORage Maintenance Working Group of the IETF. > > > > Title : RDMA Protocol Extensions > > Author(s) : Hemal Shah > > Felix Marti > > Wael Noureddine > > Asgeir Eiriksson > > Robert Sharp > > Filename : draft-ietf-storm-rdmap-ext-01.txt > > Pages : 30 > > Date : 2011-07-11 > > > > This document specifies extensions to the IETF Remote Direct Memory > > Access Protocol (RDMAP [RFC5040]). RDMAP provides read and write > > services directly to applications and enables data to be transferred > > directly into Upper Layer Protocol (ULP) Buffers without > > intermediate data copies. The extensions specified in this document > > provide the following capabilities and/or improvements: Atomic > > Operations and Immediate Data. > > > > > > > > > > A URL for this Internet-Draft is: > > http://www.ietf.org/internet-drafts/draft-ietf-storm-rdmap-ext-01.tx > > t > > > > Internet-Drafts are also available by anonymous FTP at: > > ftp://ftp.ietf.org/internet-drafts/ > > > > This Internet-Draft can be retrieved at: > > ftp://ftp.ietf.org/internet-drafts/draft-ietf-storm-rdmap-ext-01.txt > > _______________________________________________ > > storm mailing list > > storm@ietf.org > > https://www.ietf.org/mailman/listinfo/storm > > _______________________________________________ > storm mailing list > storm@ietf.org > https://www.ietf.org/mailman/listinfo/storm >
- [storm] I-D Action: draft-ietf-storm-rdmap-ext-01… internet-drafts
- Re: [storm] I-D Action: draft-ietf-storm-rdmap-ex… david.black
- Re: [storm] I-D Action: draft-ietf-storm-rdmap-ex… Tom Talpey
- Re: [storm] I-D Action: draft-ietf-storm-rdmap-ex… david.black
- Re: [storm] I-D Action: draft-ietf-storm-rdmap-ex… Tom Talpey