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

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Message-ID: <24456.1200455812@turing-police.cc.vt.edu>
Date:	Tue, 15 Jan 2008 22:56:52 -0500
From:	Valdis.Kletnieks@...edu
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>
Subject: Re: [PATCH]PCIE ASPM support - takes 2

On Tue, 15 Jan 2008 13:02:26 +0800, Shaohua Li said:

> In my test, power difference between powersave mode and performance mode
> is about 1.3w in a system with 3 PCIE links.

Do you have any numbers on what the added latency is for powersave mode, and
a rough idea of how quickly chipsets will drop to low-power? It may affect
usability a lot if it's "adds 10ms latency after 100ms idle" or "adds 100ms
latency after 5 seconds idle" or some other pattern...

(The chipset in my laptop claims to be an 82801G with 4 PCI-Express ports on
it - I'm trying to get a rough idea what usage I'd get out of that feature..)

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