From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 309EE18DF8D for ; Fri, 15 Nov 2024 23:21:54 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731712915; cv=none; b=WVaq198W2IEjY6FZhuHlXnRzotX/LDN8SjyCbi/9lKFkxdpulFWLiQ8xsXb+pqRaCQWx7NC+sQVFOXRs8IjG+inJwIdNw3fYTisVvZ3JmHe1enQ4qCFm7HSNdgqvW1fGSl0ZUEvn5LKVd5DD2QekoNGNSOQ/WrbuTKSgZ01NcFY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731712915; c=relaxed/simple; bh=UKfURWwDvtWSqqeHm5kKHmniZPeJPhF6XTUSjfdoVwk=; h=Date:From:To:Cc:Subject:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=QV1tw29yHRXHUOBWfj5tNi0j7FlJgd9YU9Cfs9g0UfWLjxRIXFxOVKye8oEo9iVuA2R3sG+Kya+fwHdWh43DJDFoyCHEh4moGtYOwNXdfKnwqGbys16zzUy4UeHl0kUpKTKTc5okQSGlXiYEONmJ6cemvVnDJGeUmrNJGFxwzQo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=LsV4sVdg; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="LsV4sVdg" 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> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable 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?