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[multipathtcp] comments on draft-hoang-mptcp-sub-rate-limit-00

Yoshifumi Nishida <nsd.ietf@gmail.com> Mon, 15 July 2019 08:40 UTC

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From: Yoshifumi Nishida <nsd.ietf@gmail.com>
Date: Mon, 15 Jul 2019 01:40:38 -0700
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To: multipathtcp <multipathtcp@ietf.org>
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Subject: [multipathtcp] comments on draft-hoang-mptcp-sub-rate-limit-00
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Hi,
I've read this draft and have some questions and comments.

1: I am wondering how to calculate and limit the sending rate of subflow.
    I think adjusting window size wouldn't be very accurate. But, we don't
want to perform expensive processing for this purpose.
2: I think this is one way information and servers don't need to send SRL
option to clients. But, the draft says "a host MUST NOT send more than
three SRL options on connection where it has not received any SRL option"
Does this mean senders need to send SRL options?
3: I am still not very sure the usage of SRL options for graceful subflow
closing. I might want to see some texts in the draft to understand how this
can be better than FIN exchange on subflows.

Thanks,
--
Yoshi

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