power saving on rtl8139

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Hello,

I have two PCI nics on my machine. One of them is RealTek RTL8139. (eth0)
This machine is a desktop.

I saw in the driver code that there are rtl8139_suspend() and
rtl8139_resume() methods, which are under #ifdef CONFIG_PM.

I assume that the rtl8139_suspend() is called when we enter power saving mode
and that rtl8139_resume() is called when we exit from power saving mode.

First,is it true?

My kernel is configured with CONFIG_PM as Y.

My question is about power saving: First, is it relevant also to
desktops ?
What is the interval of time which the device has for entering power
saving mode ? is it configurable ?

Suppose I will run "ifconfig down eth0" and will only work
with eth1. Will this trigger a call to rtl8139_suspend()?

Rgs,
Mark
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