PM policy, hotplug, power saving and WoL
- From: Henrique de Moraes Holschuh <hmh@xxxxxxxxxx>
- Date: Sat, 30 Jun 2007 15:31:23 -0300
On Sat, 30 Jun 2007, Jeff Garzik wrote:
Like SATA, we actually want to support BOTH -- active hotplug and PHY
power-down -- and so this wanders into power management policy.
Give me a knob, and we can program plenty of ethernet|SATA|USB|... drivers
to power down the PHY and save power.
While at it, could we please fix our borked WOL interface requirements, so
that the PHY is *never* to be powered down when WOL is active? This is
another deficiency that userspace has to work around in halt(8)...
If WOL is enabled and supported in a device, the kernel must never do
anything that would cause that device to stop responding to WOL packets.
OTOH, if WOL is disabled, it would be very very nice indeed to be able to
tell the kernel that yes, it is to power down the PHY if it is not in use.
Laptops appreciate it a lot, and so do the switches (which will know they
don't have to forward any traffic over that port).
--
"One disk to rule them all, One disk to find them. One disk to bring
them all and in the darkness grind them. In the Land of Redmond
where the shadows lie." -- The Silicon Valley Tarot
Henrique Holschuh
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- References:
- [PATCH] b44: power down PHY when interface down
- From: Török Edvin
- Re: [PATCH] b44: power down PHY when interface down
- From: Matthew Garrett
- Re: [PATCH] b44: power down PHY when interface down
- From: Arjan van de Ven
- PM policy, hotplug, power saving (was Re: [PATCH] b44: power down PHY when interface down)
- From: Jeff Garzik
- [PATCH] b44: power down PHY when interface down
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