linux-kernel - Re: [Intel-wired-lan] [PATCH] e1000e: Power cycle phy on PM resume

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Date:   Thu, 24 Sep 2020 15:02:36 +0200
From:   Paul Menzel <pmenzel@...gen.mpg.de>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Kai-Heng Feng <kai.heng.feng@...onical.com>,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        intel-wired-lan@...ts.osuosl.org, Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [Intel-wired-lan] [PATCH] e1000e: Power cycle phy on PM resume

Dear Andrew,


Am 23.09.20 um 21:28 schrieb Andrew Lunn:
>>>> How much does this increase the resume time?
> 
> Define resume time? Until you get the display manager unlock screen?
> Or do you need working networking?

Until network is functional again. Currently, the speed negotiation 
alone takes three(?) seconds, so making it even longer is unacceptable. 
(You wrote it below.)

> It takes around 1.5 seconds for auto negotiation to get a link. I know
> it takes me longer than that to move my fingers to the keyboard and
> type in my password to unlock the screen. So by the time you actually
> get to see your desktop, you should have link.

Not here.

> I've no idea about how the e1000e driver does link negotiation. But
> powering the PHY off means there is going to be a negotiation sometime
> later. But if you don't turn it off, the driver might be able to avoid
> doing an autoneg if the PHY has already done one when it got powered
> up.

Indeed.


Kind regards,

Paul