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Re: [tcpm] I-D Action: draft-ietf-tcpm-prr-rfc6937bis-02.txt

Yuchung Cheng <ycheng@google.com> Thu, 01 December 2022 17:21 UTC

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From: Yuchung Cheng <ycheng@google.com>
Date: Thu, 01 Dec 2022 09:21:01 -0800
Message-ID: <CAK6E8=fufPTMmRLSF5Cp3a3VXdtxPfFHNSuQ92Kz4Ocxiv_8aQ@mail.gmail.com>
To: Yoshifumi Nishida <nsd.ietf@gmail.com>
Cc: Yuchung Cheng <ycheng=40google.com@dmarc.ietf.org>, rscheff@freebsd.org, tcpm@ietf.org, draft-ietf-tcpm-prr-rfc6937bis@ietf.org, "Semke, Jeff" <Semke@netapp.com>
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Subject: Re: [tcpm] I-D Action: draft-ietf-tcpm-prr-rfc6937bis-02.txt
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Hi Yoshifumi,

We'll come up an example as you are the second reviewer asking for that.
Stay tuned.

On Sun, Nov 27, 2022 at 11:28 PM Yoshifumi Nishida <nsd.ietf@gmail.com>
wrote:

> Hi Yuchung,
>
> On Mon, Nov 14, 2022 at 12:43 PM Yuchung Cheng <ycheng=
> 40google.com@dmarc.ietf.org> wrote:
>
>>
>> > Sec 7, PRR example... You describe the forced fast retransmit on the
>> > first transmission oppty. Shouldn't that shift the "N" transmissions
>> > here one notch to the left? (The ACK for "4").
>> >
>> > PRR
>> >     ack#   X  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 18 19
>> >     cwnd:    20 20 19 19 18 17 17 16 16 15 15 14 14 13 13 12 12 11 10
>> >     pipe:    19 19 18 18 17 17 16 16 15 15 14 14 13 13 12 12 11 11 10
>> >     sent:     N  N  R  N        N     N     N     N     N     N     N
>> no because forced retransmit only applies when the fast recovery
>> starts (i.e. prr_out = 0). by ack #4, prr_out is already 1 due to the
>> first "R".
>>
>>
> Hmm. I'm not very sure which situation triggers force retransmit.
> Because I think fast recovery starts after fast retransmission which
> increases prr_out.
> --
> Yoshi
>

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