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Re: [babel] New Version Notification for draft-ietf-babel-rtt-extension-06.txt

Juliusz Chroboczek <jch@irif.fr> Wed, 17 April 2024 21:03 UTC

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Date: Wed, 17 Apr 2024 23:03:25 +0200
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From: Juliusz Chroboczek <jch@irif.fr>
To: Toke Høiland-Jørgensen <toke@toke.dk>
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Subject: Re: [babel] New Version Notification for draft-ietf-babel-rtt-extension-06.txt
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> We don't even have a BPF hook that can do this without jumping through
> a lot of weird hoops :)

Now don't you get any ideas!

> So maybe we should change the text to address the RX side only, so
> instead of:
> 
> "and receive timestamps SHOULD be computed just after the packet is
> received from the network stack."
> 
> we'd have something like:
> 
> "and receive timestamps SHOULD be computed at the earliest possible time
> after the packet is received from the networking hardware.

I'm really not sure.  There's a tradeoff here between engineering
excellence and implementability.  The wording you're suggesting might be
difficult or even impossible to implement on some systems (how many
non-Linux systems have SO_TIMESTAMP?), so I'm not sure I want to recommend
it.

On the other hand, the distinction is negligible on the receive side, so
I'm quite happy with BIRD being only conditionally compliant in this case.

-- Juliusz

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