From mboxrd@z Thu Jan  1 00:00:00 1970
From: Neal Cardwell <ncardwell@google.com>
Subject: Re: [PATCH net-next 2/2] tcp: do not aggressively quick ack after ECN events
Date: Tue, 22 May 2018 13:36:17 -0400
Message-ID: <CADVnQyku0-q3WVSOM532T324nNxEv4mTtZErE1kEpJw-3RfwmA@mail.gmail.com>
References: <20180521220857.229273-1-edumazet@google.com> <20180521220857.229273-3-edumazet@google.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="UTF-8"
Cc: David Miller <davem@davemloft.net>,
        Netdev <netdev@vger.kernel.org>, Van Jacobson <vanj@google.com>,
        Yuchung Cheng <ycheng@google.com>,
        Soheil Hassas Yeganeh <soheil@google.com>,
        Eric Dumazet <eric.dumazet@gmail.com>
To: Eric Dumazet <edumazet@google.com>
Return-path: <netdev-owner@vger.kernel.org>
Received: from mail-wm0-f65.google.com ([74.125.82.65]:40652 "EHLO
        mail-wm0-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
        with ESMTP id S1751268AbeEVRgf (ORCPT
        <rfc822;netdev@vger.kernel.org>); Tue, 22 May 2018 13:36:35 -0400
Received: by mail-wm0-f65.google.com with SMTP id j5-v6so1959339wme.5
        for <netdev@vger.kernel.org>; Tue, 22 May 2018 10:36:35 -0700 (PDT)
In-Reply-To: <20180521220857.229273-3-edumazet@google.com>
Sender: netdev-owner@vger.kernel.org
List-ID: <netdev.vger.kernel.org>

On Mon, May 21, 2018 at 6:09 PM Eric Dumazet <edumazet@google.com> wrote:

> ECN signals currently forces TCP to enter quickack mode for
> up to 16 (TCP_MAX_QUICKACKS) following incoming packets.

> We believe this is not needed, and only sending one immediate ack
> for the current packet should be enough.

> This should reduce the extra load noticed in DCTCP environments,
> after congestion events.

> This is part 2 of our effort to reduce pure ACK packets.

> Signed-off-by: Eric Dumazet <edumazet@google.com>
> ---

Acked-by: Neal Cardwell <ncardwell@google.com>

Thanks!

neal