netdev - Re: [PATCH net] tcp: fix potential underestimation on rcv

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Message-ID: <CADVnQykDjZSdGCkqJTw1pDf10AmJpDY934==V4MBKS90nbSsPw@mail.gmail.com>
Date:   Wed, 13 Dec 2017 10:04:21 -0500
From:   Neal Cardwell <ncardwell@...gle.com>
To:     Wei Wang <weiwan@...gle.com>
Cc:     David Miller <davem@...emloft.net>,
        Netdev <netdev@...r.kernel.org>,
        Eric Dumazet <edumazet@...gle.com>
Subject: Re: [PATCH net] tcp: fix potential underestimation on rcv_rtt

On Tue, Dec 12, 2017 at 7:28 PM, Wei Wang <weiwan@...gle.com> wrote:
> From: Wei Wang <weiwan@...gle.com>
>
> When ms timestamp is used, current logic uses 1us in
> tcp_rcv_rtt_update() when the real rcv_rtt is within 1 - 999us.
> This could cause rcv_rtt underestimation.
> Fix it by always using a min value of 1ms if ms timestamp is used.
>
> Fixes: 645f4c6f2ebd ("tcp: switch rcv_rtt_est and rcvq_space to high
> resolution timestamps")
>
> Signed-off-by: Wei Wang <weiwan@...gle.com>
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> ---

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

Thanks!

neal