netdev - Re: [PATCH v2 net-next 3/4] tcp: make tcp

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Message-ID: <CADVnQym_64mykcmQy8hKB8WXbKbszmAetzWpM44XtzPokW4zhA@mail.gmail.com>
Date:   Tue, 27 Nov 2018 16:22:55 -0500
From:   Neal Cardwell <ncardwell@...gle.com>
To:     Eric Dumazet <edumazet@...gle.com>
Cc:     David Miller <davem@...emloft.net>,
        Netdev <netdev@...r.kernel.org>, jean-louis@...ond.be,
        Yuchung Cheng <ycheng@...gle.com>,
        Eric Dumazet <eric.dumazet@...il.com>
Subject: Re: [PATCH v2 net-next 3/4] tcp: make tcp_space() aware of socket backlog

On Tue, Nov 27, 2018 at 10:57 AM Eric Dumazet <edumazet@...gle.com> wrote:
>
> Jean-Louis Dupond reported poor iscsi TCP receive performance
> that we tracked to backlog drops.
>
> Apparently we fail to send window updates reflecting the
> fact that we are under stress.
>
> Note that we might lack a proper window increase when
> backlog is fully processed, since __release_sock() clears
> sk->sk_backlog.len _after_ all skbs have been processed.
>
> This should not matter in practice. If we had a significant
> load through socket backlog, we are in a dangerous
> situation.
>
> Reported-by: Jean-Louis Dupond <jean-louis@...ond.be>
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> ---

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

Nice. Thanks!

neal