Date: Thu, 16 Jan 2020 20:35:53 +0100 From: Michael Tuexen <tuexen@freebsd.org> To: Jeremy Harris <jgh@wizmail.org> Cc: freebsd-transport@freebsd.org Subject: Re: TCP Fast Open Message-ID: <984788AA-EEE0-4348-9F8C-B07E650B6E09@freebsd.org> In-Reply-To: <75f12c4d-63fb-40d5-8569-f8780de63521@wizmail.org> References: <5276cc23-d37f-e55e-11c5-030314e9e32c@wizmail.org> <1206B1BE-3B7E-45D0-8C2B-6012A5CB6298@freebsd.org> <2752006b-cd6b-7b8b-d23b-ae2c794dc104@wizmail.org> <f59092f1-9f93-d5c3-e7a2-06ba88bd7385@wizmail.org> <F24D850E-C6B6-4600-9B28-2439D70447A0@freebsd.org> <f07bb11e-4f69-b714-ce8d-881e68a20c6b@wizmail.org> <46A739DC-CCF5-4EA1-802A-0D8E559AC187@freebsd.org> <70c1649f-b3b8-3c3b-ef80-22e851461e9f@wizmail.org> <75f12c4d-63fb-40d5-8569-f8780de63521@wizmail.org>
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> On 6. Dec 2019, at 15:23, Jeremy Harris <jgh@wizmail.org> wrote: >=20 > On 05/12/2019 20:31, Jeremy Harris wrote: >> On 05/12/2019 20:17, Michael Tuexen wrote: >>>> - tried TFO but the server didn't take it up >>> I would expect on =3D 0. >>=20 >> Excellent; that's the most-useful one to know. >=20 > Unfortunately, it seems not to be so; it appears > to be recording the sending of a TFO option > (of _either_ type; so a cookie-Request still > gets it set). This means I can't use it to log > "TFO was actually doing something useful for > this connection". > The TCPOPT_FAST_OPEN bit in TCP_INFO says the same > (either pre-ESTABLISHED or post-). >=20 >=20 > Another problem, this time server-side. I was hoping > to get the initial server output piggybacked on > the SYN,ACK, given the TFO design notes in > https://people.freebsd.org/~pkelsey/TFO_Design_Details.pdf >=20 > - but so far I'm not getting that. Packet capture (on lo0): > SYN -> (TFO=3DC) > 0.000224 <- SYN,ACK (TFO=3DC same value) > 0.000078 SYN,ACK -> > 0.001421 <- server_data >=20 > The 224us response time for the SYN,ACK looks immediate, not > a delack time as I'd expect. A fix is under review: https://reviews.freebsd.org/D23212 Best regards Michael > --=20 > Cheers, > Jeremy > _______________________________________________ > freebsd-transport@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-transport > To unsubscribe, send any mail to = "freebsd-transport-unsubscribe@freebsd.org"
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