Re: [tcpm] [EXTERNAL] Re: Linux doesn’t implement RFC3465
Yoshifumi Nishida <nsd.ietf@gmail.com> Mon, 09 August 2021 17:07 UTC
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From: Yoshifumi Nishida <nsd.ietf@gmail.com>
Date: Mon, 09 Aug 2021 10:07:13 -0700
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To: Neal Cardwell <ncardwell@google.com>
Cc: Yuchung Cheng <ycheng=40google.com@dmarc.ietf.org>, Vidhi Goel <vidhi_goel@apple.com>, "tcpm@ietf.org" <tcpm@ietf.org>, "mallman@icir.org" <mallman@icir.org>
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Subject: Re: [tcpm] [EXTERNAL] Re: Linux doesn’t implement RFC3465
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Yes, that was my intention. Sorry for being unclear. I thought updating RFC5681 could be impactful. So, if it would happen, I would like to make sure we won't have another update for a long time. -- Yoshi On Mon, Aug 9, 2021 at 9:53 AM Neal Cardwell <ncardwell@google.com> wrote: > I think Yoshifumi is suggesting that if the WG re-spins RFC5681 then in > addition to folding in discussion of ABC/RFC3465 the RFC5681bis could also > include the IW10 content in RFC6928. That could help save time in avoiding > promoting RFC6928 from experimental to proposed standard. > > That sounds reasonable to me as well. Although the initial window is a > somewhat independent issue that might evolve independently from the > congestion algorithm itself, so I can imagine advantages to keeping it > separate. > > neal > > > On Mon, Aug 9, 2021 at 12:39 PM Yuchung Cheng <ycheng= > 40google.com@dmarc.ietf.org> wrote: > >> Sorry I don't understand your suggestion. Is that related to ABC? could >> you explain more >> >> On Mon, Aug 9, 2021 at 1:41 AM Yoshifumi Nishida <nsd.ietf@gmail.com> >> wrote: >> >>> I don't have a strong opinion on this yet, But, if we *could* move in >>> this direction, it might be good to think about the IW explanation in >>> RFC5681 as well? >>> if we do this, we might not need to discuss promoting RFC6928. >>> -- >>> Yoshi >>> >>> On Sat, Aug 7, 2021 at 7:57 AM Neal Cardwell <ncardwell= >>> 40google.com@dmarc.ietf.org> wrote: >>> >>>> I also agree with Yuchung’s suggestion, for all of the reasons he >>>> provided. >>>> >>>> best, >>>> neal >>>> >>>> >>>> On Fri, Aug 6, 2021 at 3:59 PM Vidhi Goel <vidhi_goel= >>>> 40apple.com@dmarc.ietf.org> wrote: >>>> >>>>> I agree with Yuchung’s suggestion for all the reasons he provided. And >>>>> its better to have it at one place. >>>>> >>>>> Vidhi >>>>> >>>>> On Aug 6, 2021, at 12:53 PM, Yuchung Cheng < >>>>> ycheng=40google.com@dmarc.ietf.org> wrote: >>>>> >>>>> Hi WG >>>>> >>>>> I have been wondering if we (= IETF) should just update RFC5681 >>>>> directly, instead of another RFC3465-bis with experimental status. >>>>> >>>>> Appropriate byte counting is essential but the RFC5681 of L=1 is >>>>> detrimental. There are far more people who read RFC5681 to implement the >>>>> new stack instead of RFC3465. So we should fold the experimental RFC3465 >>>>> updates into RFC5681 directly, and obsolete RFC3465. >>>>> >>>>> This is orthogonal to the final value of L :-) >>>>> >>>>> >>>>> >>>>> >>>>> On Tue, Aug 3, 2021 at 9:42 AM Yuchung Cheng <ycheng@google.com> >>>>> wrote: >>>>> >>>>>> >>>>>> >>>>>> On Mon, Aug 2, 2021 at 6:12 PM Yuchung Cheng <ycheng@google.com> >>>>>> wrote: >>>>>> >>>>>>> >>>>>>> >>>>>>> On Mon, Aug 2, 2021 at 5:53 PM Neal Cardwell <ncardwell= >>>>>>> 40google.com@dmarc.ietf.org> wrote: >>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> On Mon, Aug 2, 2021 at 8:46 PM Praveen Balasubramanian <pravb= >>>>>>>> 40microsoft.com@dmarc.ietf.org> wrote: >>>>>>>> >>>>>>>>> In experiments a few years ago on DC networks, values over L=8 >>>>>>>>> resulted in a noticeable increase in packet drops and retransmissions >>>>>>>>> (without pacing). Windows TCP has been using L=8 for many years now. If we >>>>>>>>> do want to specify a fallback L value for implementations that cannot pace, >>>>>>>>> my suggestion would be to use the value 8. >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> Neal, are there cases where Linux is or can be deployed with >>>>>>>>> infinite L and no pacing? >>>>>>>>> >>>>>>>> >>>>>>>> Yes, "infinite L and no pacing" is the default behavior for Linux >>>>>>>> TCP, starting in 2013 for slow-start and then starting in 2015 for >>>>>>>> congestion avoidance. >>>>>>>> >>>>>>> To be more clear: both fq_pacing and TCP pacing have been disabled >>>>>>> by default in Linux upstream. We do not know how much Linux senders enable >>>>>>> them today besides the Google servers. >>>>>>> >>>>>>> Regarding L = 8, to avoid another round of why or why not. We could >>>>>>> say inf-L causes line-rate burst up to the stretched ACK degree so put a >>>>>>> comfortable L if you prefer, then mention implementation practice like >>>>>>> yours. At the end of the day it's ad-hoc (or "art") and subject to change. >>>>>>> It might be sensible to cap at cwnd to disincentivize receivers / >>>>>>> middle-boxes bunching up 10 rounds of ACKs. >>>>>>> >>>>>> Sorry please ignore my previous message about the cwnd cap. It is >>>>>> completely unnecessary -- since with ack-clocking and appropriate counting, >>>>>> a correct sender would never release more than a cwnd-worth of data. I was >>>>>> imagining the multiple application-limited burst could let the receiver >>>>>> keep holding up ACKs, but that can never exceed a cwnd worth of data. >>>>>> >>>>>> >>>>>>> >>>>>>>> >>>>>>> >>>>>>>> Yuchung pasted the URLs for the exact Linux commits above, which >>>>>>>> are: >>>>>>>> >>>>>>>> >>>>>>>> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9f9843a751d0a2057f9f3d313886e7e5e6ebaac9 >>>>>>>> >>>>>>>> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9cd981dcf174d26805a032aefa791436da709bee >>>>>>>> >>>>>>>> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c22bdca94782f05b9337d8548bde51b2f38ef17f >>>>>>>> >>>>>>>> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=814d488c61260521b1b3cc97063700a5a6667c8f >>>>>>>> >>>>>>>> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e73ebb0881ea5534ce606c1d71b4ac44db5c6930 >>>>>>>> >>>>>>>> But I understand that not everyone is in a position to read >>>>>>>> GPL-licensed code. :-) >>>>>>>> >>>>>>>> best regards, >>>>>>>> neal >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> *From:* tcpm <tcpm-bounces@ietf.org> *On Behalf Of * Neal Cardwell >>>>>>>>> *Sent:* Monday, August 2, 2021 4:18 PM >>>>>>>>> *To:* Vidhi Goel <vidhi_goel@apple.com> >>>>>>>>> *Cc:* Extensions <tcpm@ietf.org>; Mark Allman <mallman@icir.org> >>>>>>>>> *Subject:* [EXTERNAL] Re: [tcpm] Linux doesn’t implement RFC3465 >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> On Mon, Aug 2, 2021 at 7:02 PM Vidhi Goel <vidhi_goel@apple.com> >>>>>>>>> wrote: >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> On Mon, Aug 2, 2021 at 3:37 PM Mark Allman <mallman@icir.org> >>>>>>>>> wrote: >>>>>>>>> >>>>>>>>> >>>>>>>>> > The fact is that Linux CC has long moved to infinite L since >>>>>>>>> 2031, >>>>>>>>> >>>>>>>>> So, if our experience is with L=\infinity and it is demonstrably OK >>>>>>>>> why don't we say *THAT* instead of "make L=5 or L=10"? I would >>>>>>>>> submit that it makes more sense to leverage experience than it >>>>>>>>> does >>>>>>>>> >>>>>>>>> to make things up. >>>>>>>>> >>>>>>>>> +1 >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> Yes, I agree that would be a great approach to take. >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> So, we are saying it is fine to ignore L completely and simply >>>>>>>>> increase cwnd by bytes_acked during slow start? And if this causes large >>>>>>>>> bursts to be sent out (when an implementation doesn’t do pacing), that is >>>>>>>>> fine? >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> Yes, I think that is the proposal on the table, and it sounds good >>>>>>>>> to me. >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> A rationale would be: >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> (1) Implementations SHOULD pace (RFC 7661). >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> (2) Implementations that don't pace will generally be causing >>>>>>>>> large bursts for many different reasons anyway (data and/or ACK aggregation >>>>>>>>> in the network or end hosts), restart from idle,...) so having a constant L >>>>>>>>> does not provide enough protection from bursts to justify the cost in >>>>>>>>> reduced performance (in the form of slower slow-start). In support of this, >>>>>>>>> experience with this as the default behavior in Linux TCP over the >>>>>>>>> 2013-2021 period suggests this works well enough in practice. >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> neal >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>> _______________________________________________ >>>>>>>> tcpm mailing list >>>>>>>> tcpm@ietf.org >>>>>>>> https://www.ietf.org/mailman/listinfo/tcpm >>>>>>>> >>>>>>> _______________________________________________ >>>>> tcpm mailing list >>>>> tcpm@ietf.org >>>>> https://www.ietf.org/mailman/listinfo/tcpm >>>>> >>>>> >>>>> _______________________________________________ >>>> tcpm mailing list >>>> tcpm@ietf.org >>>> https://www.ietf.org/mailman/listinfo/tcpm >>>> >>> _______________________________________________ >>> tcpm mailing list >>> tcpm@ietf.org >>> https://www.ietf.org/mailman/listinfo/tcpm >>> >>
- [tcpm] Linux doesn’t implement RFC3465 Vidhi Goel
- Re: [tcpm] Linux doesn’t implement RFC3465 Neal Cardwell
- Re: [tcpm] Linux doesn’t implement RFC3465 Vidhi Goel
- Re: [tcpm] Linux doesn’t implement RFC3465 Lars Eggert
- Re: [tcpm] Linux doesn’t implement RFC3465 Vidhi Goel
- Re: [tcpm] Linux doesn’t implement RFC3465 Vidhi Goel
- Re: [tcpm] Linux doesn’t implement RFC3465 Mark Allman
- Re: [tcpm] Linux doesn’t implement RFC3465 Vidhi Goel
- Re: [tcpm] Linux doesn’t implement RFC3465 Yuchung Cheng
- Re: [tcpm] Linux doesn’t implement RFC3465 Neal Cardwell
- Re: [tcpm] Linux doesn’t implement RFC3465 Mark Allman
- Re: [tcpm] Linux doesn’t implement RFC3465 Neal Cardwell
- Re: [tcpm] Linux doesn’t implement RFC3465 Mark Allman
- Re: [tcpm] Linux doesn’t implement RFC3465 Neal Cardwell
- Re: [tcpm] Linux doesn’t implement RFC3465 Vidhi Goel
- Re: [tcpm] Linux doesn’t implement RFC3465 Yuchung Cheng
- Re: [tcpm] Linux doesn’t implement RFC3465 Vidhi Goel
- Re: [tcpm] Linux doesn’t implement RFC3465 Yuchung Cheng
- Re: [tcpm] Linux doesn’t implement RFC3465 Vidhi Goel
- Re: [tcpm] Linux doesn’t implement RFC3465 Yuchung Cheng
- Re: [tcpm] Linux doesn’t implement RFC3465 Neal Cardwell
- Re: [tcpm] Linux doesn’t implement RFC3465 Mark Allman
- Re: [tcpm] Linux doesn’t implement RFC3465 Yuchung Cheng
- Re: [tcpm] Linux doesn’t implement RFC3465 Yuchung Cheng
- Re: [tcpm] Linux doesn’t implement RFC3465 Mark Allman
- Re: [tcpm] Linux doesn’t implement RFC3465 Yuchung Cheng
- Re: [tcpm] Linux doesn’t implement RFC3465 David Lang
- Re: [tcpm] Linux doesn’t implement RFC3465 Neal Cardwell
- Re: [tcpm] Linux doesn’t implement RFC3465 Vidhi Goel
- Re: [tcpm] Linux doesn’t implement RFC3465 Neal Cardwell
- Re: [tcpm] Linux doesn’t implement RFC3465 Yuchung Cheng
- Re: [tcpm] [EXTERNAL] Re: Linux doesn’t implement… Praveen Balasubramanian
- Re: [tcpm] [EXTERNAL] Re: Linux doesn’t implement… Neal Cardwell
- Re: [tcpm] [EXTERNAL] Re: Linux doesn’t implement… Yuchung Cheng
- Re: [tcpm] [EXTERNAL] Re: Linux doesn’t implement… Yuchung Cheng
- Re: [tcpm] [EXTERNAL] Re: Linux doesn’t implement… Yuchung Cheng
- Re: [tcpm] [EXTERNAL] Re: Linux doesn’t implement… Vidhi Goel
- Re: [tcpm] [EXTERNAL] Re: Linux doesn’t implement… Neal Cardwell
- Re: [tcpm] [EXTERNAL] Re: Linux doesn’t implement… Yoshifumi Nishida
- Re: [tcpm] [EXTERNAL] Re: Linux doesn’t implement… Yuchung Cheng
- Re: [tcpm] [EXTERNAL] Re: Linux doesn’t implement… Neal Cardwell
- Re: [tcpm] Linux doesn’t implement RFC3465 Mark Allman
- Re: [tcpm] [EXTERNAL] Re: Linux doesn’t implement… Yoshifumi Nishida
- Re: [tcpm] [EXTERNAL] Re: Linux doesn’t implement… Vidhi Goel
- Re: [tcpm] [EXTERNAL] Re: Linux doesn’t implement… Yuchung Cheng
- Re: [tcpm] Linux doesn’t implement RFC3465 Yuchung Cheng
- Re: [tcpm] Linux doesn’t implement RFC3465 Mirja Kuehlewind
- Re: [tcpm] Linux doesn’t implement RFC3465 Martin Duke
- Re: [tcpm] Linux doesn’t implement RFC3465 Vidhi Goel
- Re: [tcpm] Linux doesn’t implement RFC3465 Martin Duke
- Re: [tcpm] Linux doesn’t implement RFC3465 Vidhi Goel
- Re: [tcpm] Linux doesn’t implement RFC3465 Michael Tuexen
- Re: [tcpm] Linux doesn’t implement RFC3465 Mark Allman