netdev - Re: [PATCH net v2] Revert "tcp: change pingpong threshold to 3"

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Message-ID: <CADVnQy=5VzKqUSyQG48rfYPsS1cyHAW3_bZpvJfCs6AAxjPVQA@mail.gmail.com>
Date:   Thu, 21 Jul 2022 16:55:54 -0400
From:   Neal Cardwell <ncardwell@...gle.com>
To:     Wei Wang <weiwan@...gle.com>
Cc:     David Miller <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        Soheil Hassas Yeganeh <soheil@...gle.com>,
        Yuchung Cheng <ycheng@...gle.com>, LemmyHuang <hlm3280@....com>
Subject: Re: [PATCH net v2] Revert "tcp: change pingpong threshold to 3"

On Thu, Jul 21, 2022 at 4:44 PM Wei Wang <weiwan@...gle.com> wrote:
>
> This reverts commit 4a41f453bedfd5e9cd040bad509d9da49feb3e2c.
>
> This to-be-reverted commit was meant to apply a stricter rule for the
> stack to enter pingpong mode. However, the condition used to check for
> interactive session "before(tp->lsndtime, icsk->icsk_ack.lrcvtime)" is
> jiffy based and might be too coarse, which delays the stack entering
> pingpong mode.
> We revert this patch so that we no longer use the above condition to
> determine interactive session, and also reduce pingpong threshold to 1.
>
> Fixes: 4a41f453bedf ("tcp: change pingpong threshold to 3")
> Reported-by: LemmyHuang <hlm3280@....com>
> Suggested-by: Neal Cardwell <ncardwell@...gle.com>
> Signed-off-by: Wei Wang <weiwan@...gle.com>
>
> ---
> v2: added Fixes tag

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

Looks great to me. Thanks, Wei!

neal