netdev - Re: [PATCH net-next v2 2/6] tcp: instrument how long TCP is busy sending

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Message-ID: <CADVnQymOPai5GqELLEVSr+myj6Zg=6HTnbZxwy1O74OciWgTPQ@mail.gmail.com>
Date:   Mon, 28 Nov 2016 12:24:30 -0500
From:   Neal Cardwell <ncardwell@...gle.com>
To:     Yuchung Cheng <ycheng@...gle.com>
Cc:     David Miller <davem@...emloft.net>,
        Soheil Hassas Yeganeh <soheil@...gle.com>,
        francisyyan@...il.com, Netdev <netdev@...r.kernel.org>,
        Eric Dumazet <edumazet@...gle.com>
Subject: Re: [PATCH net-next v2 2/6] tcp: instrument how long TCP is busy sending

On Mon, Nov 28, 2016 at 2:07 AM, Yuchung Cheng <ycheng@...gle.com> wrote:
> From: Francis Yan <francisyyan@...il.com>
>
> This patch measures TCP busy time, which is defined as the period
> of time when sender has data (or FIN) to send. The time starts when
> data is buffered and stops when the write queue is flushed by ACKs
> or error events.
>
> Note the busy time does not include SYN time, unless data is
> included in SYN (i.e. Fast Open). It does include FIN time even
> if the FIN carries no payload. Excluding pure FIN is possible but
> would incur one additional test in the fast path, which may not
> be worth it.
>
> Signed-off-by: Francis Yan <francisyyan@...il.com>
> Signed-off-by: Yuchung Cheng <ycheng@...gle.com>
> Signed-off-by: Soheil Hassas Yeganeh <soheil@...gle.com>
> ---

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

neal