Re: [bmwg] Ben Campbell's No Objection on draft-ietf-bmwg-dcbench-terminology-17: (with COMMENT)

Lucien <> Wed, 21 June 2017 19:18 UTC

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From: Lucien <>
Date: Wed, 21 Jun 2017 12:17:55 -0700
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To: Ben Campbell <>
Cc: The IESG <>,, Sarah Banks <>,,
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Subject: Re: [bmwg] Ben Campbell's No Objection on draft-ietf-bmwg-dcbench-terminology-17: (with COMMENT)
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Hi Ben,

Thanks for the comment! Please find my answers inline, and please
acknowledge back!

Appreciate you taking the time to look at our work.


On Wed, Jun 21, 2017 at 12:06 PM, Ben Campbell <> wrote:

> Ben Campbell has entered the following ballot position for
> draft-ietf-bmwg-dcbench-terminology-17: No Objection
> When responding, please keep the subject line intact and reply to all
> email addresses included in the To and CC lines. (Feel free to cut this
> introductory paragraph, however.)
> Please refer to
> for more information about IESG DISCUSS and COMMENT positions.
> The document, along with other ballot positions, can be found here:
> ----------------------------------------------------------------------
> ----------------------------------------------------------------------
> I find the naming of the draft fairly confusing. It goes way beyond
> "terminology"; it makes a number of normative (using 2119 language)
> statements
> about benchmarking procedures. I wonder why the sections about procedure
> did
> not go into the methodology draft instead. In general, I don't think
> putting
> normative language in an informational terminology draft is a good idea.
> (This
> would have been a DISCUSS, except that I am aware the bmwg has decided to
> make
> all its drafts informational and to still use 2119 language. For the
> record, I
> think that policy falls down with this draft.)

That's how we have decided it makes sense at BMWG to proceed with these two
drafts. We have been hashing this out for 4+ years now and the current
state is the consensus.  As author, I have no intention nor desire to
change this

> I agree with the comment from others that this does not seem to be
> specific to
> datacenters.

Great, so did we, this is why we already worked on addressing this by:

   -  calling out specifically that this specifically applies to data
   center switches (defining what those are today)
   - stating clearly that it can be applied to switches out of the data
   center, but that's not the specific scope of this

> - 2.2: Definitions of "store-and-forward" and "cut-through" when used in
> this
> context would be helpful. The first may be obvious, but the best I can do
> with
> "cut-through" is assume it means the opposite of "store-and-forward".

Those are cleary defined in RFC 1242, which we reference. We don't want to
duplicate definitions here.

> - 6.2: After reading the definition of "Incast" several times, I'm still
> not
> sure what it means or what is being measured.

It's many to one type of network traffic patterns. Its very commonly found
in cloud data centers implementing distributed storage/compute frameworks
(big data for example).