linux-kernel - Re: [PATCH]PCIE ASPM support

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Message-ID: <20080124172258.GA5447@ucw.cz>
Date:	Thu, 24 Jan 2008 17:22:58 +0000
From:	Pavel Machek <pavel@....cz>
To:	Shaohua Li <shaohua.li@...el.com>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	linux-pci <linux-pci@...ey.karlin.mff.cuni.cz>,
	Greg KH <greg@...ah.com>,
	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>,
	"Kok, Auke" <auke-jan.h.kok@...el.com>,
	Matthew Wilcox <matthew@....cx>
Subject: Re: [PATCH]PCIE ASPM support - takes 3


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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(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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