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From: Kuniyuki Iwashima <kuniyu@google.com>
To: Yongjian Wang <echoowall@gmail.com>
Cc: pabeni@redhat.com, kuba@kernel.org, shuah@kernel.org,
	edumazet@kernel.org,  horms@kernel.org, ncardwell@google.com,
	davem@davemloft.net,  linux-kernel@vger.kernel.org,
	linux-kselftest@vger.kernel.org,  netdev@vger.kernel.org,
	panweiping3@gmail.com
Subject: Re: [PATCH net-next v4 4/4] selftests/net: packetdrill: add TCP MTU probing test
Date: Sat, 14 Nov 2026 06:22:30 +0000	[thread overview]
Message-ID: <avf-GWBmzjHr5agk@google.com> (raw)
In-Reply-To: <20261111-mtu-probing-series-v4-4-6f2e484ca8ea@gmail.com>

On Wed, 11 Nov 2026 00:45:58 +0800, Yongjian Wang wrote:
> Packetization layer path MTU discovery (net.ipv4.tcp_mtu_probing=2) has
> no selftest coverage.
> 
> Add a test for an active connection. Check that it starts at
> tcp_base_mss, that it sends the first probe half way between
> tcp_base_mss and the peer's MSS once cwnd allows it, and that an
> acknowledged probe raises the MSS and leads to a larger probe.
> 
> The SYN offers timestamps and the scripted SYN-ACK declines them.
> This also checks that MTU probing uses the negotiated header length
> for the initial send MSS.
> 
> Signed-off-by: Yongjian Wang <echoowall@gmail.com>

Reviewed-by: Kuniyuki Iwashima <kuniyu@google.com>

Thanks

      reply	other threads:[~2026-11-14  6:22 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-11-10 16:45 [PATCH net-next v4 0/4] tcp: fix tcp_base_mss on passive connections and test MTU probing Yongjian Wang via B4 Relay
2026-11-10 16:45 ` [PATCH net-next v4 1/4] tcp: initialize MTU probing before syncing MSS at connection setup Yongjian Wang via B4 Relay
2026-11-10 16:45 ` [PATCH net-next v4 2/4] selftests/net: packetdrill: test tcp_base_mss on passive connections Yongjian Wang via B4 Relay
2026-11-14  6:14   ` Kuniyuki Iwashima
2026-11-10 16:45 ` [PATCH net-next v4 3/4] selftests/net: packetdrill: add TCP black hole detection tests Yongjian Wang via B4 Relay
2026-11-14  6:18   ` Kuniyuki Iwashima
2026-11-10 16:45 ` [PATCH net-next v4 4/4] selftests/net: packetdrill: add TCP MTU probing test Yongjian Wang via B4 Relay
2026-11-14  6:22   ` Kuniyuki Iwashima [this message]

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