Re: [tcpm] Thank you for the QUIC session in tcpm

Jana Iyengar <jri.ietf@gmail.com> Mon, 12 November 2018 12:11 UTC

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From: Jana Iyengar <jri.ietf@gmail.com>
Date: Mon, 12 Nov 2018 19:10:49 +0700
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To: Yoshifumi Nishida <nishida@sfc.wide.ad.jp>
Cc: ycheng=40google.com@dmarc.ietf.org, Ian Swett <ianswett@google.com>, tcpm@ietf.org
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Subject: Re: [tcpm] Thank you for the QUIC session in tcpm
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Thank you for that feedback, Bob. Our goal was to drive active
participation from more TCPM experts and regulars, and I hope we see more
of it. As for saying something un-QUIC, I wouldn't worry, but I understand
your point. I'm glad the presentation helped.

If it's valuable, we'd be happy to do another presentation in Prague with
changes between now and then.

On Fri, Nov 9, 2018 at 7:45 PM Yoshifumi Nishida <nishida@sfc.wide.ad.jp>
wrote:

>
> On Thu, Nov 8, 2018 at 4:37 PM Yuchung Cheng <ycheng=
> 40google.com@dmarc.ietf.org> wrote:
>
>> On Thu, Nov 8, 2018 at 3:14 AM, Bob Briscoe <ietf@bobbriscoe.net> wrote:
>> >
>> > I just wanted to thank Jana for explaining QUIC loss recovery to us
>> (and QUIC CC as far as it goes).
>> > And thank you Jana, Ian, the chairs of both WGs (and anyone else
>> involved) for setting it up.
>> >
>> > If one is not full-time on QUIC, it's very difficult to keep up with
>> all the changes. But now we have a checkpoint to start from, I feel I will
>> not be wasting people's time if I try to get involved - at least I only
>> might say something un-QUIC occasionally, rather than nearly always. This
>> has allowed people who understand how TCP cold be improved to help with
>> QUIC, when working on QUIC isn't their day job.
>> >
>> > Again, Thank you.
>> I like particularly that QUIC only reduces cwnd to 1 after the loss is
>> confirmed not upon RTO fires. It should be very feasible for TCP (at
>> least Linux) w/ TCP timestamps. It'll save a lot of spurious cwnd
>> reductions!
>>
>
> +1
>
>>
>> Also IMHO TCP w/ quality timestamps are almost as good as QUIC
>> pkt-ids. Google internally uses usec. We wish we could upstream it but
>> RFC needs to be updated.
>>
>
> I agree using timestamp for the purpose.
> But, if we try to utilize the TS like pkt-id, I personally think it'll be
> similar to use it as extend seqno like draft-bagnulo-tcpm-esn-00 rather
> than fine grade TS. :)
>
> In any cases, it seems to me that many people think 7232 TS is not being
> very efficient for today's internet.
> it might be good time to think about extending TS option just like what
> we're doing on ECN..  TS++?
> --
> Yoshi
>
>
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