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Date: Mon, 8 Jun 2026 14:11:28 +0200
From: Florian Westphal <fw@strlen.de>
To: Eric Dumazet <edumazet@google.com>
Cc: xietangxin <xietangxin@yeah.net>,
	Pablo Neira Ayuso <pablo@netfilter.org>,
	"David S . Miller" <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
	Simon Horman <horms@kernel.org>,
	Neal Cardwell <ncardwell@google.com>,
	Kuniyuki Iwashima <kuniyu@google.com>, Willy Tarreau <w@1wt.eu>,
	netdev@vger.kernel.org, eric.dumazet@gmail.com,
	Zhouyan Deng <dengzhouyan_nwpu@163.com>
Subject: Re: [PATCH net] tcp: secure_seq: add back ports to TS offset
Message-ID: <aiaxcKgQUqF56SHp@strlen.de>
References: <20260302205527.1982836-1-edumazet@google.com>
 <99caeafd-edf5-44a4-8742-4eada5d0f5d1@yeah.net>
 <CANn89iK8GcY3GHCRs-8EVrDoBPhdw1iY4mBjZKe8gx58+ko73Q@mail.gmail.com>
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Eric Dumazet <edumazet@google.com> wrote:
> > Is this performance degradation an expected side-effect of the security fix,
> > or is there any sysctl param we should tune when `--random-fully` is
> > required for high-concurrency short connections?
> 
> Hi Tangxin
> 
> I do not know why that patch would affect MASQUERADE performance.
> 
> Pablo, Florian, do you have an idea?

tcpdump would help.  Willy could be right, tcpdump would confirm
increase in retries.