From: Jakub Kicinski <kuba@kernel•org>
To: Sergey Ryazanov <ryazanov.s.a@gmail•com>
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
Date: Fri, 15 Nov 2024 15:21:53 -0800 [thread overview]
Message-ID: <20241115152153.5678682f@kernel.org> (raw)
In-Reply-To: <6835fde6-0863-49e8-90e8-be88e86ef346@gmail.com>
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?
next prev parent reply other threads:[~2024-11-15 23:21 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-11-14 10:20 [net-next,v2] [PATCH net-next v2] net: wwan: t7xx: Change PM_AUTOSUSPEND_MS to 5000 wojackbb
2024-11-14 15:33 ` Andrew Lunn
2024-11-14 18:54 ` Sergey Ryazanov
2024-11-15 23:21 ` Jakub Kicinski [this message]
2024-11-19 1:01 ` Sergey Ryazanov
2024-11-19 1:44 ` Jakub Kicinski
2024-11-19 1:50 ` Sergey Ryazanov
2024-11-19 2:50 ` patchwork-bot+netdevbpf
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