Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756080Ab3FPWOJ (ORCPT ); Sun, 16 Jun 2013 18:14:09 -0400 Received: from smtp-out003.kontent.com ([81.88.40.217]:55650 "EHLO smtp-out003.kontent.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755727Ab3FPWOH (ORCPT ); Sun, 16 Jun 2013 18:14:07 -0400 From: Oliver Neukum To: Ming Lei Cc: "Morales, Alejandra" , "linux-kernel@vger.kernel.org" Subject: Re: Questions about Runtime Power Management Date: Mon, 17 Jun 2013 00:15:30 +0200 Message-ID: <3436418.fmSDhCQZH6@linux-5eaq.site> User-Agent: KMail/4.10.3 (Linux/3.7.10-1.11-desktop; KDE/4.10.4; x86_64; ; ) In-Reply-To: References: <9E3F9C2076C45D4783F09B90D5BE77CE16B4E6@BADWLRZ-SWMBX13.ads.mwn.de> MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1205 Lines: 30 On Sunday 16 June 2013 23:07:36 Ming Lei wrote: > On Mon, Jun 10, 2013 at 12:28 AM, Morales, Alejandra > 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/