From: Bill Davidsen <davidsen@tmr.com>
To: Kristen Carlson Accardi <kristen.c.accardi@intel.com>
Cc: jeff@garzik.org, akpm@linux-foundation.org,
linux-kernel@vger.kernel.org, linux-ide@vger.kernel.org,
James.Bottomley@steeleye.com, edwintorok@gmail.com,
axboe@kernel.dk, linux-scsi@vger.kernel.org
Subject: Re: [patch 0/4] SATA power savings patches (ALPM)
Date: Mon, 09 Jul 2007 14:00:51 -0400 [thread overview]
Message-ID: <469277D3.2020403@tmr.com> (raw)
In-Reply-To: <20070705130357.1c172b80.kristen.c.accardi@intel.com>
Kristen Carlson Accardi wrote:
> Hi Jeff,
> Here's the most recent patches for ALPM. These are also located at:
> http://www.kernel.org/pub/linux/kernel/people/kristen/patches/SATA/alpm
>
> These patches implement Aggressive Link Power management for AHCI
> controllers. This feature is described in detail in the AHCI 1.x spec.
> It provides power savings of anywhere from .5-1.5 Watts depending on
> the system when it is enabled. (a graph demonstrating power savings
> of this patch along with other power patches is located at
> http://www.linuxpowertop.org/results.php for your enjoyment).
>
> This patch is changed from the previous version in that it incorporates all
> the feedback I've gotten on the patches to date. It changes the default
> of the ahci driver to be max_performance rather than min_power, so userspace
> will need to explicitly enable alpm via the sysfs interface when it deems
> it an appropriate time to do this. In addition, the patch was changed to
> allow either HIPM or DIPM as a prerequisite for enabling ALPM, rather than
> just using HIPM.
>
I suspect these changes would be useful for servers as well, extending
run time when a failover to UPS is detected.
--
Bill Davidsen <davidsen@tmr.com>
"We have more to fear from the bungling of the incompetent than from
the machinations of the wicked." - from Slashdot
prev parent reply other threads:[~2007-07-09 17:57 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-07-05 20:03 [patch 0/4] SATA power savings patches (ALPM) Kristen Carlson Accardi
2007-07-09 18:00 ` Bill Davidsen [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=469277D3.2020403@tmr.com \
--to=davidsen@tmr.com \
--cc=James.Bottomley@steeleye.com \
--cc=akpm@linux-foundation.org \
--cc=axboe@kernel.dk \
--cc=edwintorok@gmail.com \
--cc=jeff@garzik.org \
--cc=kristen.c.accardi@intel.com \
--cc=linux-ide@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-scsi@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.