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ECN signaling from userland Re: Getting to consensus on packet number encryption

Lars Eggert <lars@eggert.org> Thu, 05 April 2018 07:01 UTC

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From: Lars Eggert <lars@eggert.org>
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Subject: ECN signaling from userland Re: Getting to consensus on packet number encryption
Date: Thu, 05 Apr 2018 09:01:25 +0200
In-Reply-To: <3E5BCB0F-DEDE-4EBA-80DF-31E49764C0FE@trammell.ch>
Cc: Martin Thomson <martin.thomson@gmail.com>, Kazuho Oku <kazuhooku@gmail.com>, Mark Nottingham <mnot@mnot.net>, IETF QUIC WG <quic@ietf.org>, Patrick McManus <pmcmanus@mozilla.com>
To: Brian Trammell <ietf@trammell.ch>
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Hi,

On 2018-4-5, at 8:53, Brian Trammell (IETF) <ietf@trammell.ch> wrote:
> However, fixing kernel interface issues (as are at the root of UDP performance problems, as well as the lack of ECN signaling from userland) takes time

FWIW, ECN signaling is mostly only an issue on Windows at the moment. Most other stacks can do this via ancillary data on sendmsg/recvmsg. I have tested Linux, FreeBSD and Darwin and they work (modulo a bug in Darwin on TX that Apple is looking into.)

Lars

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