From: Tejun Heo <tj@kernel.org>
To: Arjan van de Ven <arjan@infradead.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: Mon, 16 Nov 2009 03:26:19 +0900 [thread overview]
Message-ID: <4B0047CB.5080509@kernel.org> (raw)
In-Reply-To: <20091115102334.1396eea6@infradead.org>
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.
Thanks.
--
tejun
next prev parent reply other threads:[~2009-11-15 18:26 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 [this message]
2009-11-15 18:33 ` Arjan van de Ven
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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