From: Florian Westphal <fw@strlen.de>
To: Antonio Ojea <antonio.ojea.garcia@gmail.com>
Cc: netfilter@vger.kernel.org
Subject: Re: Confirming conntrack behavior on environments with multiple network namespaces
Date: Tue, 30 Sep 2025 21:13:12 +0200 [thread overview]
Message-ID: <aNwrwZBc6oVyFZTJ@strlen.de> (raw)
In-Reply-To: <CABhP=tY2LnPsYk9uiF4xp4SthASYAaQ6mBWDjqy1OmOom4PK9A@mail.gmail.com>
Antonio Ojea <antonio.ojea.garcia@gmail.com> wrote:
> interesting, just to confirm, can I approximate the load factor using
> active_objects / buckets, with
>
> active_objects=$(sudo awk '$1 == "nf_conntrack" {print $2}' /proc/slabinfo)
> buckets=$(cat /proc/sys/net/netfilter/nf_conntrack_buckets)
Yes, but keep in mind that each entry is hashed twice, once for original
direction and once for reply.
The active_objects count will be higher than what ends up in the table
(e.g., if first packet of connection is dropped it is never inserted).
But it should be a good estimate.
prev parent reply other threads:[~2025-09-30 19:13 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-09-22 9:38 Confirming conntrack behavior on environments with multiple network namespaces Antonio Ojea
2025-09-23 17:07 ` Florian Westphal
2025-09-26 13:10 ` Antonio Ojea
2025-09-26 14:03 ` Florian Westphal
2025-09-26 14:41 ` Antonio Ojea
2025-09-30 19:13 ` Florian Westphal [this message]
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