From: Arjan van de Ven <arjan@infradead.org>
To: Tejun Heo <tj@kernel.org>
Cc: Jeff Garzik <jgarzik@pobox.com>,
linux-ide@vger.kernel.org, akpm@linux-foundation.org
Subject: Re: [PATCH] libata: Add ALPM power state accounting to the AHCI driver
Date: Sun, 15 Nov 2009 10:33:13 -0800 [thread overview]
Message-ID: <20091115103313.4691924d@infradead.org> (raw)
In-Reply-To: <4B0047CB.5080509@kernel.org>
On Mon, 16 Nov 2009 03:26:19 +0900
Tejun Heo <tj@kernel.org> wrote:
> Arjan van de Ven wrote:
> > On Mon, 16 Nov 2009 03:06:32 +0900
> > Tejun Heo <tj@kernel.org> wrote:
> >
> >> There's DIPM.
> >
> > where in the code is this?
>
> In ata_dev_set_dipm()?
>
> > And just to be clear: DIPM is done by the hardware so that it needs
> > sampling/etc features, rather than just straightforward (free)
> > software accounting when you do software controller transitions ?
>
> Enabling DIPM means that the drive will be in charge of transitioning
> the link into powersave modes, so if sampling SStatus is necessary to
> determine how much time the link spends in powersave mode.
do we get a link interrupt when the state changes?
(with ALPM we do.. optionally.. which is where the flag comes in)
--
Arjan van de Ven Intel Open Source Technology Centre
For development, discussion and tips for power savings,
visit http://www.lesswatts.org
next prev parent reply other threads:[~2009-11-15 18:31 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-11-14 3:24 [PATCH] libata: Add ALPM power state accounting to the AHCI driver Arjan van de Ven
2009-11-15 8:05 ` Tejun Heo
2009-11-15 8:27 ` Jeff Garzik
2009-11-15 17:46 ` Arjan van de Ven
2009-11-15 18:06 ` Tejun Heo
2009-11-15 18:23 ` Arjan van de Ven
2009-11-15 18:26 ` Tejun Heo
2009-11-15 18:33 ` Arjan van de Ven [this message]
2009-11-16 1:51 ` Tejun Heo
2009-11-16 2:00 ` Arjan van de Ven
2009-11-16 2:15 ` Tejun Heo
2009-11-16 5:55 ` Arjan van de Ven
2009-11-16 6:14 ` Tejun Heo
2009-11-16 8:13 ` Jeff Garzik
2009-11-16 14:43 ` Arjan van de Ven
2009-11-16 14:59 ` Tejun Heo
2009-11-16 15:21 ` Arjan van de Ven
2009-11-16 15:35 ` Tejun Heo
2009-11-16 15:40 ` Tejun Heo
2009-11-16 15:57 ` Alan Cox
2009-11-16 16:25 ` Tejun Heo
2009-11-16 21:25 ` Jeff Garzik
2009-11-16 21:21 ` Jeff Garzik
2009-11-17 5:25 ` Arjan van de Ven
2009-11-15 17:00 ` Arjan van de Ven
2009-11-15 18:36 ` Arjan van de Ven
2009-11-15 18:42 ` Arjan van de Ven
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