linux-kernel - Re: [PATCH net-next v4 1/4] net: tcp: send zero-window ACK when no memory

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Message-ID: <CANn89i+7YeP+N-4bWgU=dMBEhRZBjaY4njv+WhbvbVde_7DoOg@mail.gmail.com>
Date:   Fri, 11 Aug 2023 09:37:38 +0200
From:   Eric Dumazet <edumazet@...gle.com>
To:     menglong8.dong@...il.com
Cc:     ncardwell@...gle.com, davem@...emloft.net, kuba@...nel.org,
        pabeni@...hat.com, dsahern@...nel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, flyingpeng@...cent.com,
        Menglong Dong <imagedong@...cent.com>
Subject: Re: [PATCH net-next v4 1/4] net: tcp: send zero-window ACK when no memory

On Fri, Aug 11, 2023 at 5:01 AM <menglong8.dong@...il.com> wrote:
>
> From: Menglong Dong <imagedong@...cent.com>
>
> For now, skb will be dropped when no memory, which makes client keep
> retrans util timeout and it's not friendly to the users.
>
> In this patch, we reply an ACK with zero-window in this case to update
> the snd_wnd of the sender to 0. Therefore, the sender won't timeout the
> connection and will probe the zero-window with the retransmits.
>
> Signed-off-by: Menglong Dong <imagedong@...cent.com>
> ---

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