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Thu, 24 Sep 2026 02:28:02 -0700 (PDT) Received: from localhost.localdomain ([23.148.204.128]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-33e9625921asm12503976eec.15.2026.09.24.02.27.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 24 Sep 2026 02:28:02 -0700 (PDT) From: Wang Zhan To: netdev@vger.kernel.org, Willem de Bruijn Cc: davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, horms@kernel.org, keyong.sun@smartx.com, Wang Zhan , Andrew Lunn , Jason Wang , Neal Cardwell , Kuniyuki Iwashima , Alice Mikityanska , Ilya Maximets , Aaron Conole , Eelco Chaudron , dev@openvswitch.org Subject: Re: [PATCH net-next v2 2/4] net: gso: support bounded TCP segmentation Date: Thu, 24 Sep 2026 17:27:53 +0800 Message-ID: <20260924092753.4183347-1-wang.zhan@smartx.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: References: <20260918084651.3022878-1-wang.zhan@smartx.com> <20260918084651.3022878-3-wang.zhan@smartx.com> <20260920131231.3610688-1-wang.zhan@smartx.com> <20260923103825.4000903-1-wang.zhan@smartx.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit On Wed, 23 Sep 2026 12:44:27 -0400 Willem de Bruijn wrote: > Wang Zhan wrote: >> On Mon, 21 Sep 2026 17:07:09 -0400 Willem de Bruijn wrote: >> > Somewhat tangential, but an entirely different practical approach >> > could be to disable BIG-TCP when such a patch from BIG-TCP capable to >> > non-capable device is encountered. >> >> That means a single device in the topology which does not support BIG TCP >> forces every other device to turn BIG TCP off, to avoid the degradation. >> So with mixed devices and a dynamic topology, BIG TCP cannot be enabled at all. > > True. A question is how likely such a scenario with mixed devices is. > I.e., is it worth the code complexity. I cannot say how common the mixed case is, but with this patch enabling BIG TCP on a device becomes a local decision: if the peer supports it the path is faster, and if it does not the path stays at what it would be without BIG TCP.