netdev - Re: [PATCH v15 net-next 08/14] tcp: accecn: AccECN needs to know delivered bytes

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Message-ID: <CANn89iKvwM4EFwzuLXOr8OzddQto_rPfdBHUMLzS=xxG3USzTg@mail.gmail.com>
Date: Thu, 21 Aug 2025 05:24:15 -0700
From: Eric Dumazet <edumazet@...gle.com>
To: chia-yu.chang@...ia-bell-labs.com
Cc: pabeni@...hat.com, linux-doc@...r.kernel.org, corbet@....net, 
	horms@...nel.org, dsahern@...nel.org, kuniyu@...zon.com, bpf@...r.kernel.org, 
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	Jason_Livingood@...cast.com, vidhi_goel@...le.com
Subject: Re: [PATCH v15 net-next 08/14] tcp: accecn: AccECN needs to know
 delivered bytes

On Fri, Aug 15, 2025 at 1:39 AM <chia-yu.chang@...ia-bell-labs.com> wrote:
>
> From: Ilpo Järvinen <ij@...nel.org>
>
> AccECN byte counter estimation requires delivered bytes
> which can be calculated while processing SACK blocks and
> cumulative ACK. The delivered bytes will be used to estimate
> the byte counters between AccECN option (on ACKs w/o the
> option).
>
> Non-SACK calculation is quite annoying, inaccurate, and
> likely bogus.

Does it mean AccECN depends on SACK ?

>
> Signed-off-by: Ilpo Järvinen <ij@...nel.org>
> Signed-off-by: Chia-Yu Chang <chia-yu.chang@...ia-bell-labs.com>
> Acked-by: Paolo Abeni <pabeni@...hat.com>

Reviewed-by: Eric Dumazet <edumazet@...gle.com>