[bmwg] [Technical Errata Reported] RFC8239 (6768)

[RFC Errata System <[e-mail]>]

The following errata report has been submitted for RFC8239,
"Data Center Benchmarking Methodology".

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You may review the report below and at:
https://www.rfc-editor.org/errata/eid6768

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Type: Technical
Reported by: Leonard Yu <[e-mail]>

Section: 3.2

Original Text
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3) Measure maximum port pair buffer sizes.

      o  First iteration: Ingress port 1 sending line rate to egress
         port 2, ingress port 3 sending line rate to egress port 4, etc.
         Ingress port N-1 and port N will oversubscribe, at 1% of line
         rate, egress port 2 and port 3, respectively.  Measure the
         buffer size value by multiplying the number of extra frames
         sent by the frame size for each egress port.

      o  Second iteration: Ingress port 1 sending line rate to egress
         port 2, ingress port 3 sending line rate to egress port 4, etc.
         Ingress port N-1 and port N will oversubscribe, at 1% of line
         rate, egress port 4 and port 5, respectively.  Measure the
         buffer size value by multiplying the number of extra frames
         sent by the frame size for each egress port.

      o  Last iteration: Ingress port 1 sending line rate to egress
         port 2, ingress port 3 sending line rate to egress port 4, etc.
         Ingress port N-1 and port N will oversubscribe, at 1% of line
         rate, egress port N-3 and port N-2, respectively.  Measure the
         buffer size value by multiplying the number of extra frames
         sent by the frame size for each egress port.

Corrected Text
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3) Measure maximum port pair buffer sizes.

      o  First iteration: Ingress port 1 sending line rate to egress
         port 2, ingress port 3 sending line rate to egress port 4, etc.
         Ingress port N-1 and port N will oversubscribe, at 1% of line
         rate, egress port 1 and port 2, respectively.  Measure the
         buffer size value by multiplying the number of extra frames
         sent by the frame size for each egress port.

      o  Second iteration: Ingress port 1 sending line rate to egress
         port 2, ingress port 3 sending line rate to egress port 4, etc.
         Ingress port N-1 and port N will oversubscribe, at 1% of line
         rate, egress port 3 and port 4, respectively.  Measure the
         buffer size value by multiplying the number of extra frames
         sent by the frame size for each egress port.

      o  Last iteration: Ingress port 1 sending line rate to egress
         port 2, ingress port 3 sending line rate to egress port 4, etc.
         Ingress port N-1 and port N will oversubscribe, at 1% of line
         rate, egress port N-3 and port N-2, respectively.  Measure the
         buffer size value by multiplying the number of extra frames
         sent by the frame size for each egress port.

Notes
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The oversubscribed ports are a pair of ingress and egress ports. The oversubscribed ports in the texts describing the first are port 2 & 3, which are incorrect, should be port 1 & 2. The oversubscribed ports in the texts describing the second are port 4 & 5, which are incorrect, should be port 3 & 4.

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RFC8239 (draft-ietf-bmwg-dcbench-methodology-18)
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Title               : Data Center Benchmarking Methodology
Publication Date    : August 2017
Author(s)           : L. Avramov, J. Rapp
Category            : INFORMATIONAL
Source              : Benchmarking Methodology
Area                : Operations and Management
Stream              : IETF
Verifying Party     : IESG