From: patchwork-bot+netdevbpf@kernel.org
To: Jiayuan Chen <jiayuan.chen@linux.dev>
Cc: netdev@vger.kernel.org, stable@vger.kernel.org,
dsahern@kernel.org, idosch@nvidia.com, davem@davemloft.net,
edumazet@google.com, kuba@kernel.org, pabeni@redhat.com,
horms@kernel.org, shuah@kernel.org, linux-kernel@vger.kernel.org,
linux-kselftest@vger.kernel.org
Subject: Re: [PATCH net v2 1/2] net: advertise TCP MSS from the configured MTU, not the learned PMTU
Date: Thu, 20 Aug 2026 19:30:27 +0000 [thread overview]
Message-ID: <178725422789.446762.4527576854549285289.git-patchwork-notify@kernel.org> (raw)
In-Reply-To: <20260815070413.294559-1-jiayuan.chen@linux.dev>
Hello:
This series was applied to netdev/net.git (main)
by Jakub Kicinski <kuba@kernel.org>:
On Sat, 15 Aug 2026 15:03:36 +0800 you wrote:
> The MSS a host puts in its SYN tells the peer how big a segment it may
> send us. Right now we can shrink it with a PMTU we learned on our own
> send path, which is the wrong direction entirely.
>
> On asymmetric paths this bites - think DSR load balancers, where the
> request side goes through a smaller-MTU overlay. We learn a small PMTU
> going out, then advertise a small MSS, and the peer stays capped for the
> whole connection even though its path back to us is wide. MSS only shows
> up in the SYN and never grows back.
>
> [...]
Here is the summary with links:
- [net,v2,1/2] net: advertise TCP MSS from the configured MTU, not the learned PMTU
https://git.kernel.org/netdev/net/c/2640e6419594
- [net,v2,2/2] selftests: net: packetdrill: add tests for advertised MSS with PMTU exceptions
https://git.kernel.org/netdev/net/c/e5c8e301b497
You are awesome, thank you!
--
Deet-doot-dot, I am a bot.
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prev parent reply other threads:[~2026-08-20 19:31 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-08-15 7:03 [PATCH net v2 1/2] net: advertise TCP MSS from the configured MTU, not the learned PMTU Jiayuan Chen
2026-08-15 7:15 ` [PATCH net v2 2/2] selftests: net: packetdrill: add tests for advertised MSS with PMTU exceptions Jiayuan Chen
2026-08-20 10:57 ` [PATCH net v2 1/2] net: advertise TCP MSS from the configured MTU, not the learned PMTU Eric Dumazet
2026-08-20 19:30 ` patchwork-bot+netdevbpf [this message]
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