Re: [tcpm] [Technical Errata Reported] RFC8312 (5907)
Mirja Kuehlewind <ietf@kuehlewind.net> Wed, 04 March 2020 11:13 UTC
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From: Mirja Kuehlewind <ietf@kuehlewind.net>
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Date: Wed, 04 Mar 2020 12:12:59 +0100
Cc: rhee@ncsu.edu, Lisong Xu <xu@unl.edu>, Sangtae Ha <sangtae.ha@colorado.edu>, alexander.zimmermann@rwth-aachen.de, "Eggert, Lars" <lars@netapp.com>, Richard Scheffenegger <rs.ietf@gmx.at>, Magnus Westerlund <magnus.westerlund@ericsson.com>, "Scharf, Michael" <michael.scharf@hs-esslingen.de>, Michael Tuexen <tuexen@fh-muenster.de>, Yoshifumi Nishida <nsd.ietf@gmail.com>, tcpm <tcpm@ietf.org>, Elliott Ecton <elliott.ecton@netapp.com>
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References: <20191114020710.3359AF406D8@rfc-editor.org> <CADVnQynZPCXyzbh88ZhOkm851xQqyNoe_4sfcbz8cmQM2_=x7A@mail.gmail.com> <CADVnQynapHH=qs=FChCWestO8R=E5PYcRO78jBvs-w28n0fqtg@mail.gmail.com>
To: Neal Cardwell <ncardwell@google.com>
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Subject: Re: [tcpm] [Technical Errata Reported] RFC8312 (5907)
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Hi Neal, hi all, I rejected this errata, as I think you are right about section 4.2. However, the text in section 5.1 does not really indicate that this is the case, so I guess we could file a separate editorial errata to clarify this. Do the authors have any opinions here? Mirja > On 15. Nov 2019, at 20:54, Neal Cardwell <ncardwell@google.com> wrote: > > On Thu, Nov 14, 2019 at 12:53 PM Neal Cardwell <ncardwell@google.com> wrote: >> >> On Thu, Nov 14, 2019 at 12:12 PM RFC Errata System >> <rfc-editor@rfc-editor.org> wrote: >>> >>> The following errata report has been submitted for RFC8312, >>> "CUBIC for Fast Long-Distance Networks". >>> >>> -------------------------------------- >>> You may review the report below and at: >>> https://www.rfc-editor.org/errata/eid5907 >>> >>> -------------------------------------- >>> Type: Technical >>> Reported by: Elliott Ecton <elliott.ecton@netpp.com> >>> >>> Section: 5.1 >>> >>> Original Text >>> ------------- >>> +--------+----------+-----------+------------+-----------+----------+ >>> | Loss | Average | Average | CUBIC | CUBIC | CUBIC | >>> | Rate P | TCP W | HSTCP W | (C=0.04) | (C=0.4) | (C=4) | >>> +--------+----------+-----------+------------+-----------+----------+ >>> | 10^-2 | 12 | 12 | 12 | 12 | 12 | >>> | 10^-3 | 38 | 38 | 38 | 38 | 59 | >>> | 10^-4 | 120 | 263 | 120 | 187 | 333 | >>> | 10^-5 | 379 | 1795 | 593 | 1054 | 1874 | >>> | 10^-6 | 1200 | 12279 | 3332 | 5926 | 10538 | >>> | 10^-7 | 3795 | 83981 | 18740 | 33325 | 59261 | >>> | 10^-8 | 12000 | 574356 | 105383 | 187400 | 333250 | >>> +--------+----------+-----------+------------+-----------+----------+ >>> >>> Table 1 >>> >>> Corrected Text >>> -------------- >>> +--------+----------+-----------+------------+-----------+----------+ >>> | Loss | Average | Average | CUBIC | CUBIC | CUBIC | >>> | Rate P | TCP W | HSTCP W | (C=0.04) | (C=0.4) | (C=4) | >>> +--------+----------+-----------+------------+-----------+----------+ >>> | 10^-2 | 12 | 12 | 3 | 6 | 11 | >>> | 10^-3 | 38 | 38 | 19 | 33 | 59 | >>> | 10^-4 | 120 | 263 | 120 | 187 | 333 | >>> | 10^-5 | 379 | 1795 | 593 | 1054 | 1874 | >>> | 10^-6 | 1200 | 12279 | 3332 | 5926 | 10538 | >>> | 10^-7 | 3795 | 83981 | 18740 | 33325 | 59261 | >>> | 10^-8 | 12000 | 574356 | 105383 | 187400 | 333250 | >>> +--------+----------+-----------+------------+-----------+----------+ >>> >>> Table 1 >>> >>> Notes >>> ----- >>> The CUBIC average window sizes for 10^2 and 10^3 are incorrect in the original text using expression 6. >> >> I strongly suspect that the original text is correct. >> >> Note that the proposed edit would cause the average congestion window >> size of CUBIC to be below that of "TCP W", the Reno [RFC5681] window, >> in the cases with loss rates of 10^-2 and 10^-3. But as mentioned in >> section 4.2. "TCP-Friendly Region", where the native CUBIC curve >> computation produces a target congestion window that is lower than the >> congestion window Reno would use, the CUBIC algorithm instead uses the >> Reno target congestion window. So the average congestion window size >> of CUBIC should not be below that of Reno. I believe that is why in >> the original table the average congestion window for "TCP W" and CUBIC >> match in cases with loss rates of 10^-2 and 10^-3 and with CUBIC using >> C=0.04 or C=0.4. >> >> Are there tests or simulations showing CUBIC achieving a lower >> congestion window in these cases with loss rates of 10^-2 and 10^-3? >> >> best, >> neal > > I got a bounce from my "reply-all". It seems there was a typo in the > e-mail address of the report, and it should have been: > Elliott Ecton <elliott.ecton@netapp.com> > ...rather than: > Elliott Ecton <elliott.ecton@netpp.com> > > I am following up to make sure the elliott.ecton@netapp.com address > has the reply and the thread has the correct e-mail address. > > best, > neal >
- [tcpm] [Technical Errata Reported] RFC8312 (5907) RFC Errata System
- Re: [tcpm] [Technical Errata Reported] RFC8312 (5… Neal Cardwell
- Re: [tcpm] [Technical Errata Reported] RFC8312 (5… Neal Cardwell
- Re: [tcpm] [Technical Errata Reported] RFC8312 (5… Mirja Kuehlewind
- Re: [tcpm] [Technical Errata Reported] RFC8312 (5… Mirja Kuehlewind