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From: "Li, Shaohua" <shaohua.li@intel.com>
To: "Pavel Machek" <pavel@ucw.cz>
Cc: "lkml" <linux-kernel@vger.kernel.org>,
	"linux-pci" <linux-pci@atrey.karlin.mff.cuni.cz>,
	"Greg KH" <greg@kroah.com>,
	"Pallipadi, Venkatesh" <venkatesh.pallipadi@intel.com>,
	"Kok, Auke-jan H" <auke-jan.h.kok@intel.com>,
	"Matthew Wilcox" <matthew@wil.cx>
Subject: RE: [PATCH]PCIE ASPM support - takes 3
Date: Fri, 25 Jan 2008 16:01:32 +0800	[thread overview]
Message-ID: <FC1D1B23302A22499C60C967336B2AE0024F0A74@pdsmsx411.ccr.corp.intel.com> (raw)
In-Reply-To: <20080124172258.GA5447@ucw.cz>

>
>
>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?
Haven't accurate number, but in one device, it declaims L0s latency is <
128ns, L1 latency is < 64us.

Thanks,
Shaohua

  reply	other threads:[~2008-01-25  8:43 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-01-18  1:56 Shaohua Li
2008-01-22 22:58 ` Greg KH
2008-01-23  2:20   ` Shaohua Li
2008-01-23 18:26     ` Greg KH
2008-01-24  2:21       ` Shaohua Li
2008-01-25 22:41         ` patch pci-pcie-aspm-support.patch added to gregkh-2.6 tree gregkh
2008-02-02 10:55           ` [bootup crash, -git] " Ingo Molnar
2008-02-02 18:51             ` Greg KH
2008-02-02 19:37               ` Ingo Molnar
2008-02-19  5:45               ` [bootup crash, -git] Re: patch pci-pcie-aspm-support.patchadded " Shaohua Li
2008-02-19 23:45                 ` Greg KH
2008-02-20  1:36                   ` Shaohua Li
2008-02-20  4:14                     ` Greg KH
2008-02-20  4:48                       ` Shaohua Li
2008-02-20  5:04                         ` Greg KH
2008-02-20  5:24                           ` Shaohua Li
2008-02-20  5:42                             ` Greg KH
2008-02-20  6:21                               ` Shaohua Li
2008-01-24 17:22 ` [PATCH]PCIE ASPM support - takes 3 Pavel Machek
2008-01-25  8:01   ` Li, Shaohua [this message]
2008-01-28 23:14   ` Kok, Auke

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