netdev - Re: [PATCH] [net,v2] net: wwan: t7xx: add PM_AUTOSUSPEND_MS_BY

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Message-ID: <562c8ee8-7ce3-4343-9d93-b01be1235954@lunn.ch>
Date: Tue, 15 Oct 2024 14:08:47 +0200
From: Andrew Lunn <andrew@...n.ch>
To: 吳逼逼 <wojackbb@...il.com>
Cc: netdev@...r.kernel.org, chandrashekar.devegowda@...el.com,
	chiranjeevi.rapolu@...ux.intel.com, haijun.liu@...iatek.com,
	m.chetan.kumar@...ux.intel.com, ricardo.martinez@...ux.intel.com,
	loic.poulain@...aro.org, ryazanov.s.a@...il.com,
	johannes@...solutions.net, davem@...emloft.net, edumazet@...gle.com,
	kuba@...nel.org, pabeni@...hat.com,
	linux-arm-kernel@...ts.infradead.org,
	angelogioacchino.delregno@...labora.com,
	linux-mediatek@...ts.infradead.org, matthias.bgg@...il.com
Subject: Re: [PATCH] [net,v2] net: wwan: t7xx: add
 PM_AUTOSUSPEND_MS_BY_DW5933E for Dell DW5933e

On Tue, Oct 15, 2024 at 10:48:15AM +0800, 吳逼逼 wrote:
> Hi Andrew,
> 
> We have a power test that uses a small script to loop through the power_state
> of Dell DW5933e.(/sys/bus/pci/devices/..../power_state)
> 
> We expect that PCIE can enter the D3 state when Host don;t have data packet
> transmission,
> but the experimental result of the small script test is that it is only in the
> D3 state about 5% of the time.
> 
> We analyze logs to found that Dell DW5933e occasionally sends signal change
> notifications, and ModemManager occasionally captures Modem status.
> Although these situations are not very frequent,
> However, since the default auto suspend time is 20 seconds, the chance of PCIE
> being able to enter the D3 state is very small.
> 
> After we changed auto suspend to 5 seconds, PCIE have 50% of the time was in D3
> state, which met Dell's requirements.

So you answered some of my questions. But missed:

What makes this machine special?

It is maybe because this machine occasionally sends signal change
notifications? There are modem status changes?

Have you compared this to other machines with the same hardware? Do
they do the same? Or is this Dell special? If it is special, why is it
special?

	Andrew