From: Oliver Neukum <oliver@neukum.org>
To: Ming Lei <tom.leiming@gmail.com>
Cc: "Morales, Alejandra" <alejandra.morales@tum.de>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: Questions about Runtime Power Management
Date: Mon, 17 Jun 2013 00:15:30 +0200 [thread overview]
Message-ID: <3436418.fmSDhCQZH6@linux-5eaq.site> (raw)
In-Reply-To: <CACVXFVPrb-6WXadXyYE923+1_MA+y-9p1RRO=ufXXJCkEJu+OQ@mail.gmail.com>
On Sunday 16 June 2013 23:07:36 Ming Lei wrote:
> On Mon, Jun 10, 2013 at 12:28 AM, Morales, Alejandra
> <alejandra.morales@tum.de> wrote:
>
> > - Is runtime power management supported by net devices?
>
> Currently, 'struct net_device' doesn't support runtime power management,
> and I submitted one patch to add the support for solving accessing
> suspended device by 'ethtool', but it was rejected.
>
> http://marc.info/?t=135054860600003&r=1&w=2
And the discussion is still useful and true.
> But the physical device of the net device can support runtime PM, for example,
> some PCIe network devices support runtime PM on link change, and usbnet
> devices support auto suspend.
There is a design behind runtime PM. Runtime PM is involved if a device looses
capabilities in a power saving state. Or if it is a dependency among runtime PM
of devices. Therefore it is not used for things like Energy Efficient Ethernet.
Regards
Oliver
prev parent reply other threads:[~2013-06-16 22:14 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-09 16:28 Morales, Alejandra
2013-06-10 8:39 ` Oliver Neukum
2013-06-11 7:53 ` Morales, Alejandra
2013-06-11 8:21 ` Oliver Neukum
2013-06-16 15:07 ` Ming Lei
2013-06-16 22:15 ` Oliver Neukum [this message]
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