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Status:Verified (1)

RFC 8239, "Data Center Benchmarking Methodology", August 2017

Errata ID:5652
Status: Verified
Type: Technical
Publication Format(s) : TEXT
Reported By: Nikolai Malykh
Date Reported: 2019-03-12
Verifier Name: Warren Kumari (Ops AD)
Date Verified: 2019-09-06

Section 3.2 says:

      o  Last iteration: Ingress port N-2 sending line rate to egress         port N-1, while port N is sending a known low amount of         oversubscription traffic (1% recommended) with the same packet         size to egress port N.  Measure the buffer size value by         multiplying the number of extra frames sent by the frame size.

It should say:

      o  Last iteration: Ingress port N-2 sending line rate to egress         port N-1, while port N is sending a known low amount of         oversubscription traffic (1% recommended) with the same packet         size to egress port N-1.  Measure the buffer size value by         multiplying the number of extra frames sent by the frame size.

Notes:

Incorrect number of the output port for oversubscription traffic.

[WK]: See https://mailarchive.ietf.org/arch/msg/bmwg/_zZOrFmBwGq3dc5Pfb833tmLSGk for additional context.

Status:Rejected (2)

RFC 8239, "Data Center Benchmarking Methodology", August 2017

Errata ID:6763
Status: Rejected
Type: Technical
Publication Format(s) : TEXT
Reported By: Leonard Yu
Date Reported: 2021-11-30
Rejected by: Mohamed Boucadair
Date Rejected: 2025-03-28

Section 3.2 says:

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

It should say:

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

Notes:

If
#1, 1->2, 3->4, 5->6, 7->8, ... and N-1->2, N->3
#2, 1->2, 3->4, 5->6, 7->8, ... and N-1->4, N->5

Then
#last, 1->2, 3->4, 5->6, 7->8, ... and N-1->N-4, N->N-3

Otherwise, the general equation won't satisfy #1 and #2
--VERIFIER NOTES--
Per https://mailarchive.ietf.org/arch/msg/bmwg/gILuO-tG7uTC_ve5kfYyJSo-7h4/

Errata ID:6768
Status: Rejected
Type: Technical
Publication Format(s) : TEXT
Reported By: Leonard Yu
Date Reported: 2021-12-01
Rejected by: Mohamed Boucadair
Date Rejected: 2025-03-28

Section 3.2 says:

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.

It should say:

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:

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.
--VERIFIER NOTES--
See https://mailarchive.ietf.org/arch/msg/bmwg/LrV7P2Oc7ElYpOCxUtLQu3hxRLU/

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