netdev - Re: [PATCH net] tcp: use current time in tcp_rcv_space

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Date:   Wed, 6 Dec 2017 14:54:09 -0500
From:   Neal Cardwell <ncardwell@...gle.com>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     David Miller <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>, Wei Wang <weiwan@...gle.com>,
        Yuchung Cheng <ycheng@...gle.com>
Subject: Re: [PATCH net] tcp: use current time in tcp_rcv_space_adjust()

On Wed, Dec 6, 2017 at 2:08 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> From: Eric Dumazet <edumazet@...gle.com>
>
> When I switched rcv_rtt_est to high resolution timestamps, I forgot
> that tp->tcp_mstamp needed to be refreshed in tcp_rcv_space_adjust()
>
> Using an old timestamp leads to autotuning lags.
>
> Fixes: 645f4c6f2ebd ("tcp: switch rcv_rtt_est and rcvq_space to high resolution timestamps")
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Cc: Wei Wang <weiwan@...gle.com>
> Cc: Neal Cardwell <ncardwell@...gle.com>
> Cc: Yuchung Cheng <ycheng@...gle.com>
> ---

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

neal