netdev - Re: [PATCH net] netfilter: conntrack:

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Message-ID: <CANn89i+sfROgQUaNR+eMc2BWxtOjMmLgqsv52A1iLGhyydrBbg@mail.gmail.com>
Date:   Tue, 7 Mar 2023 06:27:37 +0100
From:   Eric Dumazet <edumazet@...gle.com>
To:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        Florian Westphal <fw@...len.de>,
        Jozsef Kadlecsik <kadlec@...filter.org>
Cc:     netdev@...r.kernel.org, netfilter-devel@...r.kernel.org,
        coreteam@...filter.org, eric.dumazet@...il.com
Subject: Re: [PATCH net] netfilter: conntrack:

On Tue, Mar 7, 2023 at 6:22 AM Eric Dumazet <edumazet@...gle.com> wrote:
>
> Customers using GKE 1.25 and 1.26 are facing conntrack issues
> root caused to commit c9c3b6811f74 ("netfilter: conntrack: make
> max chain length random").
>
> Even if we assume Uniform Hashing, a bucket often reachs 8 chained
> items while the load factor of the hash table is smaller than 0.5
>

Sorry for the messed patch title.

This should have been:

netfilter: conntrack: adopt safer max chain length

Florian, Pablo, let me know if you want me to send a v2, thanks !