Re: [bmwg] WG Last Call: draft-ietf-bmwg-ngfw-performance-05

"Vratko Polak -X (vrpolak - PANTHEON TECH SRO at Cisco)" <vrpolak@cisco.com> Wed, 23 December 2020 15:31 UTC

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From: "Vratko Polak -X (vrpolak - PANTHEON TECH SRO at Cisco)" <vrpolak@cisco.com>
To: "bmwg@ietf.org" <bmwg@ietf.org>
CC: "MORTON, ALFRED C (AL)" <acm@research.att.com>
Thread-Topic: WG Last Call: draft-ietf-bmwg-ngfw-performance-05
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Date: Wed, 23 Dec 2020 15:31:08 +0000
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Subject: Re: [bmwg] WG Last Call: draft-ietf-bmwg-ngfw-performance-05
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> Please read and express your opinion on whether or not this
> Internet-Draft should be forwarded to the Area Directors for
> publication as an Informational RFC.  

The current draft is a large document, and I will have multiple comments.
I expect some of them will be addressed by creating -06 version,
so my opinion is -05 should not be forwarded for publication.

> Send your comments to this list or to co-chairs at bmwg-chairs@ietf.com

The issue is, I do not have all the comments ready yet.
In general, I need to spend some effort when turning
my nebulous ideas into coherent sentences
(mostly because only when writing the sentences
I realize the topic is even more complicated than I thought at first).

Also, specifically for BMWG, I want my comments to be more complete than usual.
Not just "I do not like/understand this sentence",
but give a new sentence and a short explanation why the new sentence is better.
I have two reasons for aiming for high quality comments.
First, I imagine many people are reading this list.
That means, if I write a lazy superficial comment,
I save my time, but readers will spend more time trying to reconstruct my meaning.
(Similar to how in software development, code is written once but read many times.)
Second reason is high latency on this mailing list.
Usually, by the time the author reacts to the comments,
the reviewer has switched their attention to other tasks,
so it is better when the first comment does not need any
subsequent clarifications from the reviewer.

> allow for holidays and other competing topics

I reserved some time before holidays, originally for improving MLRsearch,
but NGFW is closer to publishing so it takes precedence.

My plan is to start with giving a few low-quality comments,
mainly to hint what areas I want to see improved.
After holidays, I will write higher quality comments, one e-mail per area.
This e-mail contains the low-quality comments (in decreasing order of brevity).

1. Test Bed Considerations. Useful, but maybe should be expanded into a separate draft.
(Mainly expanding on "testbed reference pre-tests",
and what to do if they fail but we still want some results.)

2. Sentence with "safety margin of 10%". Unclear.
If you want to add or subtract, name both the quantity before and after the operation,
so in later references it is clear which quantity is referenced.
Also, why 10% and not something else (e.g. 5%)?

3. Is it "test bed" or "testbed"?
I assume it means "SUT" plus "test equipment" together,
but is should be clarified.

4. Sustain phase follows after ramp-up phase immediately,
without any pause, right? Then there is in-flight traffic
at sustain phase start and end, making it hard to get precise counters.

5. Validation criteria. The draft contains terms "target throughput" and "initial throughput",
but also phrases like "the maximum and average achievable throughput within the validation criteria".
I am not even sure if validation criteria apply to a trial
(e.g. telemetry suggests test equipment behavior was not stable enough)
or a whole search (e.g. maximum achievable throughput is below acceptance threshold).

6. It seems the same word "throughput" is used to mean different quantities depending on context.
Close examination suggests it probably means forwarding rate [0]
except the offered load [1] is not given explicitly (and maybe is not even constant).
When I see "throughput" I think [2] (max offered load with no loss),
which does not work as generally the draft allows some loss.
Also, some terms (e.g. "http throughput") do not refer to packets,
but other "transactions".

7. SUT state affecting performance. The draft does not mention any,
so I think it assumes "stateless" SUT.
An example of "stateful" SUT is NAT, where opening sessions
has smaller performance than forwarding on already opened sessions.
Or maybe it is assumed any such state enters a stationary state during ramp-up,
so in sustain phase the performance is stable
(e.g. NAT sessions may be timing out, but in a stable rate).

8. Stateless or stateful traffic generation. Here stateless means
predetermined packets are sent at predetermined times.
Stateful means time or content of next-to-send packet
depends on time or content of previously received packets.
Draft section 7.1 looks like stateless traffic to me (think IMIX [3]),
while others look like stateful (you cannot count http transaction rate
from lossy stateless traffic).
In general, stateful traffic is more resource intensive for test equipment,
so it is harder to achieve high enough offered load.
Also, stateful traffic generation is more sensitive
to packet loss and latency of SUT.

Vratko.

[0] https://tools.ietf.org/html/rfc2285#section-3.6.1
[1] https://tools.ietf.org/html/rfc2285#section-3.5.2
[2] https://tools.ietf.org/html/rfc2544#section-26.1
[3] https://tools.ietf.org/html/rfc6985

-----Original Message-----
From: bmwg <bmwg-bounces@ietf.org> On Behalf Of MORTON, ALFRED C (AL)
Sent: Friday, 2020-December-18 19:16
To: bmwg@ietf.org
Subject: [bmwg] WG Last Call: draft-ietf-bmwg-ngfw-performance-05

Hi BMWG,

We will start a WG Last Call for

Benchmarking Methodology for Network Security Device Performance

https://tools.ietf.org/html/draft-ietf-bmwg-ngfw-performance-05

The WGLC will close on 22 January, 2021, allow for holidays and 
other competing topics (IOW, plenty of time!)

Please read and express your opinion on whether or not this
Internet-Draft should be forwarded to the Area Directors for
publication as an Informational RFC.  Send your comments
to this list or to co-chairs at bmwg-chairs@ietf.com

for the co-chairs,
Al

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