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

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Message-ID: <CAEA6p_A3gswp+Ji==POEaFsXViYQPAZU-D+unqBuyNOdwbWHBg@mail.gmail.com>
Date:   Thu, 21 Jul 2022 13:12:10 -0700
From:   Wei Wang <weiwan@...gle.com>
To:     Neal Cardwell <ncardwell@...gle.com>
Cc:     Jakub Kicinski <kuba@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
        Yuchung Cheng <ycheng@...gle.com>,
        Soheil Hassas Yeganeh <soheil@...gle.com>,
        LemmyHuang <hlm3280@....com>
Subject: Re: [PATCH net] Revert "tcp: change pingpong threshold to 3"

On Thu, Jul 21, 2022 at 5:21 AM Neal Cardwell <ncardwell@...gle.com> wrote:
>
> On Wed, Jul 20, 2022 at 7:32 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.
> >
> > Reported-by: LemmyHuang <hlm3280@....com>
> > Suggested-by: Neal Cardwell <ncardwell@...gle.com>
> > Signed-off-by: Wei Wang <weiwan@...gle.com>
> > ---
>
> Thanks, Wei. The substance of the change looks good to me. I would
> suggest adding a Fixes: tag as the first footer in the commit message
> to make sure this gets backported to the appropriate stable branches.
> Otherwise this looks great.

Thanks. Will send v2 with Fixes tag.

>
> Thanks!
> neal