From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 79670D68BDC for ; Fri, 15 Nov 2024 23:23:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:MIME-Version:References:In-Reply-To:Message-ID:Subject:Cc:To: From:Date:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=UKfURWwDvtWSqqeHm5kKHmniZPeJPhF6XTUSjfdoVwk=; b=wN+oTR4/2l8M9GEExLB0ZjSrLM b/Pa6i4wBOiEAO+pmS49O6kpzgzSkO8+E586c5FzZnYOzGvLGdz+hw1S1cFM4gOD9+KFelpttqtNX 9uW7V4OxBRAvEIXVaeo7bH9DRSMql9obdrTj3kRpcALLqt9/b6vA9RF/yKuaYN0R1sqDT9RAIKnNc nGP2Ofq99Bfb7sC+i04qSxrUlfezByVb1FnZyQTrTUqduWIIUfwYSpIHA47KRF0nLptrjnN02lWwe kPA6P8L2paB9641lY2T6+8Hwbs3rSe/FsrbYhtdwSiPYi2+ktB8cjqXgyPZNuAjKRn2AuCk7okBn9 fOZZT7yg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1tC5eO-00000004Y1d-2sUQ; Fri, 15 Nov 2024 23:22:52 +0000 Received: from nyc.source.kernel.org ([2604:1380:45d1:ec00::3]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1tC5dT-00000004XvU-36KH; Fri, 15 Nov 2024 23:21:56 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by nyc.source.kernel.org (Postfix) with ESMTP id 1853EA426BC; Fri, 15 Nov 2024 23:20:01 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0E1E6C4CECF; Fri, 15 Nov 2024 23:21:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1731712914; bh=UKfURWwDvtWSqqeHm5kKHmniZPeJPhF6XTUSjfdoVwk=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=LsV4sVdgpvW1g76R/yd9MXfJEdFvLvA6ONdP9sjLPJWwKVY2B2Z36R5MBp+gwF9ZN kuRlA8FP6ylyfXC3I0oPgy61b6Ag2Eh4XET2nneCbC4+4q/fdPNNK5HVt0+BUEyMhw qPvllORMrR/W4qkWdmYMgYU1PLVFg4Ctz2rbKUhuoVMos/V8cVsy6iz7gm46EZZBo3 eCrx7/tJcDhroYFCfunXAjgT61N4wIYlUqpWch8WvYrKDCU9QcbHy6bV6L0UmTBSHs X+YB2FLmBPk/NiYEMyT8J+Su611gwsawps9JC5tYG6gYJv1xJ/DZwC/9o2YTGF0kTZ mO4ildP/MiIOA== Date: Fri, 15 Nov 2024 15:21:53 -0800 From: Jakub Kicinski To: Sergey Ryazanov 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 Subject: Re: [net-next,v2] [PATCH net-next v2] net: wwan: t7xx: Change PM_AUTOSUSPEND_MS to 5000 Message-ID: <20241115152153.5678682f@kernel.org> In-Reply-To: <6835fde6-0863-49e8-90e8-be88e86ef346@gmail.com> References: <20241114102002.481081-1-wojackbb@gmail.com> <6835fde6-0863-49e8-90e8-be88e86ef346@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241115_152155_837943_1F2182E3 X-CRM114-Status: GOOD ( 13.02 ) 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 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. =20 >=20 > Possible negative outcomes for data transmission still need=20 > clarification. Let me repeat it here. >=20 > On 06.11.2024 13:10, =E5=90=B3=E9=80=BC=E9=80=BC wrote: > > Receiving or sending data will cause PCIE to change D3 Cold to D0 state= . =20 >=20 > Am I understand it correctly that receiving IP packets on downlink will=20 > cause PCIe link re-activation? >=20 >=20 > I am concerned about a TCP connection that can be idle for a long period= =20 > of time. For example, an established SSH connection can stay idle for=20 > minutes. If I connected to a server and execute something like this: >=20 > user@host$ sleep 20 && echo "Done" >=20 > Will I eventually see the "Done" message or will the autosuspended modem= =20 > effectively block any incoming traffic? And how long does it take for=20 > the modem to wake up and deliver a downlink packet to the host? Have you= =20 > measured StDev change? He's decreasing the sleep timer from 20 to 5 sec, both of which=20 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?