netdev - Re: [PATCH net-next] TLP: Don't reschedule PTO when there's one outstanding TLP retransmission.

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Message-ID: <CADVnQykJBO_cGrLL6Y_4XPYEt4-WJdp6D2e1MoWrcAcMyFbu0w@mail.gmail.com>
Date:   Fri, 28 Jul 2017 18:57:20 -0400
From:   Neal Cardwell <ncardwell@...gle.com>
To:     maowenan <maowenan@...wei.com>
Cc:     Yuchung Cheng <ycheng@...gle.com>, Netdev <netdev@...r.kernel.org>,
        David Miller <davem@...emloft.net>,
        "weiyongjun (A)" <weiyongjun1@...wei.com>,
        Chenweilong <chenweilong@...wei.com>,
        Nandita Dukkipati <nanditad@...gle.com>,
        "Wangkefeng (Kevin)" <wangkefeng.wang@...wei.com>
Subject: Re: [PATCH net-next] TLP: Don't reschedule PTO when there's one
 outstanding TLP retransmission.

On Wed, Jul 26, 2017 at 9:28 PM, maowenan <maowenan@...wei.com> wrote:
> Ok, please check as below. Server: 192.169.0.18, client: 192.169.0.17
> ......

Thanks for this trace! Here is a condensed version that I believe
should be equivalent, for those who are working on parsing what's
going on:

2.239562 srv > cli: P 544:616(72) ack 351 win 92
2.240034 srv > cli: P 616:688(72) ack 351 win 92
2.260764 srv > cli: P 616:688(72) ack 351 win 92    # TLP
3.018020 cli > srv: . ack 616 win 1970
3.018386 srv > cli: P 688:760(72) ack 351 win 92    # srv sends B
3.022448 srv > cli: P 760:832(72) ack 351 win 92    # srv sends C
3.033813 cli > srv: P 351:0437(86) ack 616 win 1970 # data/ACK 616
3.034213 cli > srv: P 437:0523(86) ack 616 win 1970 # data/ACK 616
3.034633 srv > cli: . ack 523 win 92
3.039512 cli > srv: P 523:0659(136) ack 616 win 1970
3.040083 cli > srv: P 659:0795(136) ack 616 win 1970
3.040491 srv > cli: . ack 795 win 92
3.041161 cli > srv: P 795:0931(136) ack 616 win 1970
3.042828 cli > srv: P 931:1032(101) ack 616 win 1970
3.043198 srv > cli: . ack 1032 win 92

For the record, I posted my diagnosis of this issue in your thread for
the v2 version of the patch.

thanks,
neal