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

"Brian Trammell (IETF)" <ietf@trammell.ch> Thu, 05 April 2018 07:03 UTC

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From: "Brian Trammell (IETF)" <ietf@trammell.ch>
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Subject: Re: ECN signaling from userland Re: Getting to consensus on packet number encryption
Date: Thu, 05 Apr 2018 09:02:58 +0200
In-Reply-To: <0F07FB8F-A8D0-4F2B-8ED8-7230DF99EE7C@eggert.org>
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: Lars Eggert <lars@eggert.org>
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> On 5 Apr 2018, at 09:01, Lars Eggert <lars@eggert.org> wrote:
> 
> 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.)

Ah, I thought this was a more widely spread problem. Okay, cool, we can focus more on making UDP not suck then. :)

Thanks, cheers,

Brian

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