netdev - Re: [net-next V2 08/15] net/mlx5e: Add TX PTP port object support

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Message-ID: <20201204181029.6d356002@kicinski-fedora-pc1c0hjn.DHCP.thefacebook.com>
Date:   Fri, 4 Dec 2020 18:10:29 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     Saeed Mahameed <saeed@...nel.org>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        Eran Ben Elisha <eranbe@...dia.com>,
        Tariq Toukan <tariqt@...dia.com>,
        Richard Cochran <richardcochran@...il.com>,
        Vladimir Oltean <vladimir.oltean@....com>,
        Willem de Bruijn <willemdebruijn.kernel@...il.com>
Subject: Re: [net-next V2 08/15] net/mlx5e: Add TX PTP port object support

On Sat, 5 Dec 2020 03:49:27 +0200 Vladimir Oltean wrote:
> So there you go, it just says "the reference plane marking the boundary
> between the PTP node and the network". So it depends on how you draw the
> borders. I cannot seem to find any more precise definition.

Ah, you made me go search :)

I was referring to what's now section 90 of IEEE 802.3-2018.

> Regardless of the layer at which the timestamp is taken, it is the
> jitter that matters more than the reduced path delay. The latter is just
> a side effect.