Re: [aqm] [tcpm] TCP ACK Suppression
Greg White <g.white@CableLabs.com> Mon, 12 October 2015 23:08 UTC
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From: Greg White <g.white@CableLabs.com>
To: Jonathan Morton <chromatix99@gmail.com>, David Lang <david@lang.hm>
Thread-Topic: [aqm] [tcpm] TCP ACK Suppression
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Date: Mon, 12 Oct 2015 23:08:41 +0000
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References: <5618005A.8070303@isi.edu> <70335.1444421059@lawyers.icir.org> <D23D8CA5.54DF5%g.white@cablelabs.com> <56183B49.4000506@isi.edu> <alpine.DEB.2.02.1510091511540.3717@nftneq.ynat.uz> <56183E93.1010308@isi.edu> <alpine.DEB.2.02.1510091528320.3717@nftneq.ynat.uz> <5618420E.9040609@isi.edu> <alpine.DEB.2.02.1510091628010.3717@nftneq.ynat.uz> <5618554F.3080103@isi.edu> <alpine.DEB.2.02.1510091716100.3717@nftneq.ynat.uz> <56185E44.9050702@isi.edu> <alpine.DEB.2.02.1510091910170.3717@nftneq.ynat.uz> <561891C3.90004@isi.edu> <alpine.DEB.2.02.1510092134190.15683@nftneq.ynat.uz> <5618AF0A.4010101@isi.edu> <alpine.DEB.2.02.1510101439090.1856@nftneq.ynat.uz> <alpine.DEB.2.02.1510101525170.1856@nftneq.ynat.uz> <F62FF3E5-EC9E-4534-B005-2A987C63C41D@gmail.com> <alpine.DEB.2.02.1510102042280.1856@nftneq.ynat.uz> <5619F00A.2040009@isi.edu> <alpine.DEB.2.02.1510111358310.2053@nftneq.ynat.uz> <561AD47B.9030602@isi.edu> <alpine.DEB.2.02.1510111526050.10958@nftneq.ynat.uz> <CAJq5cE1KM-wxTB8nB_AbXcniLbCbHn6M=4bM0uaLRY2s=YNUjQ@mail.gmail.com>
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Cc: "LAUTENSCHLAEGER, Wolfram (Wolfram)" <wolfram.lautenschlaeger@alcatel-lucent.com>, "tcpm@ietf.org" <tcpm@ietf.org>, "mallman@icir.org" <mallman@icir.org>, "aqm@ietf.org" <aqm@ietf.org>, Joe Touch <touch@isi.edu>
Subject: Re: [aqm] [tcpm] TCP ACK Suppression
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> My contention is that since this is already happening, consolidating the ACK packets into stretched ACKs doesn't make this any worse, and it saves network bandwidth (and decreases latency to the extent that data is acked faster than waiting for the entire chain or original ACKs to get through, especially if that would take multiple transmit windows). As a result, thinning the ACKs is kinder to the network. I agree, *iff* they are not DupACKs signalling packet loss. Do existing and future cable modems take that subtle distinction into account? I presume that they are not discarding DupACKs or corrupting SACK in some way (the whole point of specialized ACK handling is to ensure good TCP performance after all), but since the algorithms are proprietary, for existing cable modems I don't know. I will contact the developers as well as run some tests on a few modems to get a better idea (and maybe Mikael already has some data from his recent testing he could share?). For future modems, I can add an explicit reference to RFC3449 in the DOCSIS 3.1 spec just in case implementers aren't aware for some reason.
- [aqm] TCP ACK Suppression Mikael Abrahamsson
- Re: [aqm] TCP ACK Suppression Greg White
- Re: [aqm] TCP ACK Suppression Mikael Abrahamsson
- Re: [aqm] TCP ACK Suppression LAUTENSCHLAEGER, Wolfram (Wolfram)
- Re: [aqm] TCP ACK Suppression Bless, Roland (TM)
- Re: [aqm] TCP ACK Suppression Mikael Abrahamsson
- Re: [aqm] TCP ACK Suppression Clark Gaylord
- Re: [aqm] TCP ACK Suppression Steve Bauer
- Re: [aqm] TCP ACK Suppression Francini, Andrea (Andrea)
- Re: [aqm] TCP ACK Suppression Richard Scheffenegger
- Re: [aqm] TCP ACK Suppression Greg White
- Re: [aqm] TCP ACK Suppression Bless, Roland (TM)
- Re: [aqm] TCP ACK Suppression David Lang
- Re: [aqm] TCP ACK Suppression David Collier-Brown
- Re: [aqm] TCP ACK Suppression Jonathan Morton
- Re: [aqm] TCP ACK Suppression David Lang
- Re: [aqm] TCP ACK Suppression David Lang
- Re: [aqm] TCP ACK Suppression Richard Scheffenegger
- Re: [aqm] TCP ACK Suppression Yuchung Cheng
- Re: [aqm] TCP ACK Suppression Jonathan Morton
- Re: [aqm] TCP ACK Suppression Jonathan Morton
- Re: [aqm] TCP ACK Suppression David Lang
- Re: [aqm] TCP ACK Suppression David Lang
- Re: [aqm] TCP ACK Suppression Joe Touch
- Re: [aqm] TCP ACK Suppression Joe Touch
- Re: [aqm] TCP ACK Suppression Greg White
- Re: [aqm] TCP ACK Suppression David Lang
- Re: [aqm] TCP ACK Suppression Joe Touch
- Re: [aqm] TCP ACK Suppression Yuchung Cheng
- Re: [aqm] TCP ACK Suppression Joe Touch
- Re: [aqm] TCP ACK Suppression David Lang
- Re: [aqm] TCP ACK Suppression Joe Touch
- Re: [aqm] TCP ACK Suppression David Lang
- Re: [aqm] TCP ACK Suppression Christian Huitema
- Re: [aqm] TCP ACK Suppression Rick Jones
- Re: [aqm] TCP ACK Suppression David Lang
- Re: [aqm] TCP ACK Suppression Christian Huitema
- Re: [aqm] TCP ACK Suppression David Collier-Brown
- Re: [aqm] TCP ACK Suppression Simon Barber
- Re: [aqm] TCP ACK Suppression David Lang
- Re: [aqm] TCP ACK Suppression David Lang
- Re: [aqm] TCP ACK Suppression David Lang
- Re: [aqm] TCP ACK Suppression Yuchung Cheng
- Re: [aqm] TCP ACK Suppression Joe Touch
- Re: [aqm] TCP ACK Suppression Joe Touch
- Re: [aqm] TCP ACK Suppression Joe Touch
- Re: [aqm] TCP ACK Suppression David Lang
- Re: [aqm] TCP ACK Suppression David Lang
- Re: [aqm] TCP ACK Suppression David Lang
- Re: [aqm] TCP ACK Suppression Joe Touch
- Re: [aqm] TCP ACK Suppression Joe Touch
- Re: [aqm] TCP ACK Suppression David Lang
- Re: [aqm] TCP ACK Suppression David Lang
- Re: [aqm] [tcpm] TCP ACK Suppression Joe Touch
- Re: [aqm] [tcpm] TCP ACK Suppression Greg White
- Re: [aqm] [tcpm] TCP ACK Suppression Joe Touch
- Re: [aqm] [tcpm] TCP ACK Suppression David Lang
- Re: [aqm] [tcpm] TCP ACK Suppression Joe Touch
- Re: [aqm] [tcpm] TCP ACK Suppression David Lang
- Re: [aqm] [tcpm] TCP ACK Suppression Joe Touch
- Re: [aqm] [tcpm] TCP ACK Suppression David Lang
- Re: [aqm] [tcpm] TCP ACK Suppression Joe Touch
- Re: [aqm] [tcpm] TCP ACK Suppression David Lang
- Re: [aqm] [tcpm] TCP ACK Suppression Joe Touch
- Re: [aqm] [tcpm] TCP ACK Suppression David Lang
- Re: [aqm] [tcpm] TCP ACK Suppression David Lang
- Re: [aqm] [tcpm] TCP ACK Suppression David Lang
- Re: [aqm] [tcpm] TCP ACK Suppression Joe Touch
- Re: [aqm] [tcpm] TCP ACK Suppression David Lang
- Re: [aqm] [tcpm] TCP ACK Suppression Joe Touch
- Re: [aqm] TCP ACK Suppression Simon Barber
- Re: [aqm] TCP ACK Suppression David Lang
- Re: [aqm] [tcpm] TCP ACK Suppression David Lang
- Re: [aqm] [tcpm] TCP ACK Suppression David Lang
- Re: [aqm] [tcpm] TCP ACK Suppression Dave Taht
- Re: [aqm] [tcpm] TCP ACK Suppression Jonathan Morton
- Re: [aqm] [tcpm] TCP ACK Suppression Jonathan Morton
- Re: [aqm] [tcpm] TCP ACK Suppression Simon Barber
- Re: [aqm] [tcpm] TCP ACK Suppression Joe Touch
- Re: [aqm] [tcpm] TCP ACK Suppression David Lang
- Re: [aqm] [tcpm] TCP ACK Suppression David Lang
- Re: [aqm] [tcpm] TCP ACK Suppression David Lang
- Re: [aqm] [tcpm] TCP ACK Suppression David Lang
- Re: [aqm] [tcpm] TCP ACK Suppression Joe Touch
- Re: [aqm] [tcpm] TCP ACK Suppression David Lang
- Re: [aqm] [tcpm] TCP ACK Suppression Joe Touch
- Re: [aqm] [tcpm] TCP ACK Suppression David Lang
- Re: [aqm] [tcpm] TCP ACK Suppression Jonathan Morton
- Re: [aqm] [tcpm] TCP ACK Suppression David Lang
- Re: [aqm] [tcpm] TCP ACK Suppression Mikael Abrahamsson
- Re: [aqm] [tcpm] TCP ACK Suppression David Lang
- Re: [aqm] [tcpm] TCP ACK Suppression Greg White
- Re: [aqm] [tcpm] TCP ACK Suppression Joe Touch
- Re: [aqm] [tcpm] TCP ACK Suppression David Lang
- Re: [aqm] [tcpm] TCP ACK Suppression David Lang