netdev - Re: [PATCH] tcp: Fix tcp_max_syn_backlog limit on connection requests

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Message-ID: <5gI82sir9U2gaHqvZgEXtxtdFJnbS_9geSflUCqgXjNKjtQfHmBWsfqaNuauMKKpefp5yrcgF7rs7O65ZBGFXL8mLFODpfc_bmB2ZBUgyQM=@protonmail.com>
Date:   Fri, 03 Jan 2020 13:19:00 +0000
From:   Ttttabcd <ttttabcd@...tonmail.com>
To:     Eric Dumazet <edumazet@...gle.com>
Cc:     Netdev <netdev@...r.kernel.org>,
        David Miller <davem@...emloft.net>,
        "kuznet@....inr.ac.ru" <kuznet@....inr.ac.ru>,
        "yoshfuji@...ux-ipv6.org" <yoshfuji@...ux-ipv6.org>
Subject: Re: [PATCH] tcp: Fix tcp_max_syn_backlog limit on connection requests

However, I think that backward compatibility should not be too serious because sysctl_max_syn_backlog is only enabled when syn_cookies is turned off.

If sysctl_max_syn_backlog is set small, there is no difference between the original code and the new code.

Only in the BUG scenarios I mentioned in the patch, the system behavior will change, but these are corrections that have no impact on users.

It's just that the part of the request retention queue will not be mistakenly occupied, and earlier use of syn cookies instead of filling up the backlog.