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Mon, 18 Nov 2024 17:01:15 -0800 (PST) Received: from [192.168.0.2] ([69.6.8.124]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-432dab76dafsm172723215e9.10.2024.11.18.17.01.12 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 18 Nov 2024 17:01:14 -0800 (PST) Message-ID: <7e5e2bda-e80d-46ec-816a-613c5808222e@gmail.com> Date: Tue, 19 Nov 2024 03:01:47 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [net-next,v2] [PATCH net-next v2] net: wwan: t7xx: Change PM_AUTOSUSPEND_MS to 5000 To: Jakub Kicinski Cc: wojackbb@gmail.com, netdev@vger.kernel.org, chandrashekar.devegowda@intel.com, chiranjeevi.rapolu@linux.intel.com, haijun.liu@mediatek.com, m.chetan.kumar@linux.intel.com, ricardo.martinez@linux.intel.com, loic.poulain@linaro.org, johannes@sipsolutions.net, davem@davemloft.net, edumazet@google.com, pabeni@redhat.com, linux-arm-kernel@lists.infradead.org, angelogioacchino.delregno@collabora.com, linux-mediatek@lists.infradead.org, matthias.bgg@gmail.com References: <20241114102002.481081-1-wojackbb@gmail.com> <6835fde6-0863-49e8-90e8-be88e86ef346@gmail.com> <20241115152153.5678682f@kernel.org> Content-Language: en-US From: Sergey Ryazanov In-Reply-To: <20241115152153.5678682f@kernel.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241118_170118_038333_EB123877 X-CRM114-Status: GOOD ( 13.39 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 16.11.2024 01:21, Jakub Kicinski wrote: > On Thu, 14 Nov 2024 20:54:20 +0200 Sergey Ryazanov wrote: >>> We tested Fibocom FM350 and our products using the t7xx and they all >>> benefited from this. >> >> Possible negative outcomes for data transmission still need >> clarification. Let me repeat it here. >> >> On 06.11.2024 13:10, 吳逼逼 wrote: >>> Receiving or sending data will cause PCIE to change D3 Cold to D0 state. >> >> Am I understand it correctly that receiving IP packets on downlink will >> cause PCIe link re-activation? >> >> >> I am concerned about a TCP connection that can be idle for a long period >> of time. For example, an established SSH connection can stay idle for >> minutes. If I connected to a server and execute something like this: >> >> user@host$ sleep 20 && echo "Done" >> >> Will I eventually see the "Done" message or will the autosuspended modem >> effectively block any incoming traffic? And how long does it take for >> the modem to wake up and deliver a downlink packet to the host? Have you >> measured StDev change? > > He's decreasing the sleep timer from 20 to 5 sec, both of which > are very high for networking, anyway. You appear to be questioning > autosuspend itself but it seems to have been added 2 years ago already. > > What am I missing? Some possible funny side-effect of sleeping with this chipset. Like loosing network connection and dropping TCP sessions. I hope that 20 seconds was putted on purpose. Suddenly, I don't have this modem at hand and want to be sure that we are not going to receive a stream of bug reports. -- Sergey