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Method: Manual source code review between May 1 and May 8 2020. Initial windows experimentally confirmed via our 0-RTT tests where applicable.
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Elements marked in orange deviate from IETF QUIC recommendations
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ImplementationRepo URLLanguage
Congestion Control Algorithm(s)
max_datagram_sizek_initial_windowInitial k_minimum_windowk_loss_reduction_factorPacing?Hystart?
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aioquichttps://github.com/aiortc/aioquicPython 3New Reno12801280025600,5TRUETRUE
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Total implementation count: 15
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Haskell quichttps://github.com/kazu-yamamoto/quicHaskellNoneFALSEFALSE
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Cubic
litespeed, mvfst, picoquic, quiche, quic-go, google
7/15
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New Reno9/15
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LiteSpeed QUIChttps://github.com/litespeedtech/lsquicCCubic [default]146046720TRUEFALSEBBR4/15
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BBR1460467205840TRUEFALSE
Others like COPA
3/15
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msqquichttps://github.com/microsoft/msquicCCubic1280128002560TRUEFALSE8/15
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15
mvfsthttps://github.com/facebookincubator/mvfstC++New Reno IPv412521252025040,5FALSEFALSE
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Cubic IPv4 [default]12521252025040,8TRUETRUE
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Copa IPv41252125202504TRUEFALSE
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BBR IPv41252125205008TRUEFALSE
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New Reno IPv612321232024640,5FALSEFALSE
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Cubic IPv6 [default]12321232024640,8TRUETRUE1310/15
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Copa IPv61232123202464TRUEFALSE
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BBR IPv61232123204928TRUEFALSE
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Neqohttps://github.com/mozilla/neqoRustNew Reno [guess]13371337026740,5TRUEFALSE
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ngtcp2https://github.com/ngtcp2/ngtcp2C, C++New Reno [guess]12001200024000,5FALSEFALSE
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picoquichttps://github.com/private-octopus/picoquicCNew Reno [default]15361536030720,5TRUETRUE
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Cubic1536153603072TRUETRUE
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BBR1536153603072TRUETRUE
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Fast TCP1536153603072TRUETRUE
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quanthttps://github.com/NTAP/quantCNew Reno IPv4 [guess]12521252025040,5FALSEFALSE
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New Reno IPv6 [guess]12321232024640,5FALSEFALSE
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quiche [cloudflare]https://github.com/cloudflare/quicheRustReno14521452029040,5FALSETRUE
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Cubic [default]1452145202904FALSETRUE
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quiclyhttps://github.com/h2o/quiclyCReno [maybe New Reno?]14721472029440,7FALSEFALSE
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quincyhttps://github.com/protocol7/quincyJavaNoneFALSEFALSE
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quinnhttps://github.com/djc/quinnRustNew Reno [Guess]12001200024000,5FALSEFALSE
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quic-gohttps://github.com/lucas-clemente/quic-gogoCubic1252400642504TRUETRUE
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quiche [google]https://quiche.googlesource.com/quiche/C++Cubic14602920FALSEFALSE
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BBR1460467205840TRUEFALSE
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BBRV21460467205840TRUEFALSE
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PRRFALSEFALSE
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TCP CubicTRUETRUE
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