netdev - Re: [PATCH v9 net-next 01/15] tcp: try to avoid safer when ACKs are thinned

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Message-ID: <CANn89i+44At=GtWMjksjjMmARZONeVAAiDgqAP2jXWSK3BxJLQ@mail.gmail.com>
Date: Tue, 20 Jan 2026 10:27:30 +0100
From: Eric Dumazet <edumazet@...gle.com>
To: chia-yu.chang@...ia-bell-labs.com
Cc: pabeni@...hat.com, parav@...dia.com, linux-doc@...r.kernel.org, 
	corbet@....net, horms@...nel.org, dsahern@...nel.org, kuniyu@...gle.com, 
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Subject: Re: [PATCH v9 net-next 01/15] tcp: try to avoid safer when ACKs are thinned

On Mon, Jan 19, 2026 at 7:59 PM <chia-yu.chang@...ia-bell-labs.com> wrote:
>
> From: Ilpo Järvinen <ij@...nel.org>
>
> Add newly acked pkts EWMA. When ACK thinning occurs, select
> between safer and unsafe cep delta in AccECN processing based
> on it. If the packets ACKed per ACK tends to be large, don't
> conservatively assume ACE field overflow.
>
> This patch uses the existing 2-byte holes in the rx group for new
> u16 variables withtout creating more holes. Below are the pahole
> outcomes before and after this patch:

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