netdev - Re: Does "TCP Fast Open": not work on 6.14.7?

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Message-ID: <2a85cc0b3932c7e7e891a8d4558b0372924bc625.camel@yandex.ru>
Date: Mon, 26 May 2025 15:00:19 +0300
From: Konstantin Kharlamov <Hi-Angel@...dex.ru>
To: Jeremy Harris <jgh@...mail.org>, netdev@...r.kernel.org
Subject: Re: Does "TCP Fast Open": not work on 6.14.7?

On Mon, 2025-05-26 at 12:40 +0100, Jeremy Harris wrote:
> On 2025/05/26 10:02 AM, Konstantin Kharlamov wrote:
> > 3. Connect to it with `nc -v localhost 8080`
> 
> The application needs to specifically request TFO.

Aaaah, I see… Thank you, I thought it is a transparent feature.

So that's interesting, apparently as of today, decade later after the
feature was introduced, it's almost unused. I'm writing this from a
laptop with 1 day and 5 hours uptime, where I've actively used
Qutebrowser, Firefox and once Chromium for browsing (and with
tcp_fastopen = 1 OOTB), but all values are 0… Anyway, I guess that's
offtopic, thank you for clarification!