Re: [PATCH]PCIE ASPM support - takes 3

[Pavel Machek]

Hi!

> v3->v2, fixed the issues Matthew Wilcox raised.
> 
> PCI Express ASPM defines a protocol for PCI Express components in the D0
> state to reduce Link power by placing their Links into a low power state
> and instructing the other end of the Link to do likewise. This
> capability allows hardware-autonomous, dynamic Link power reduction
> beyond what is achievable by software-only controlled power management.
> However, The device should be configured by software appropriately.
> Enabling ASPM will save power, but will introduce device latency.

How big is the latency? 1msec? 10msec? 100usec?

-- 
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