Intel X25-M and device-initiated interface power management

Intel X25-M and device-initiated interface power management

[Tino Keitel]

Hi,

I read that the Intel X25-M SSD consumes less than 0,3W during typical
usage if DIPM is enabled.  This would give noticable power saving even
compared to a spinned down hard disk.  I checked the hdparm -I output
on my notebook with the current hard disk, and it shows this:

*	Device-initiated interface power management

When searching for the corresponding hdparm output with X25-M in
google, I found only hdparm output with this feature unset.

What can I expect with a X25-M on my hardware regarding DIPM? It is a
ThinkPad X61s, lspci shows this:

00:1f.2 SATA controller [0106]: Intel Corporation 82801HBM/HEM
(ICH8M/ICH8M-E) SATA AHCI Controller [8086:2829] (rev 03)

Please CC: me in replies, as I'm not subscribed.

Regards,
Tino

Re: Intel X25-M and device-initiated interface power management

[Robert Hancock]

On 03/16/2010 04:05 PM, Tino Keitel wrote:
> Hi,
>
> I read that the Intel X25-M SSD consumes less than 0,3W during typical
> usage if DIPM is enabled.  This would give noticable power saving even
> compared to a spinned down hard disk.  I checked the hdparm -I output
> on my notebook with the current hard disk, and it shows this:
>
> *	Device-initiated interface power management
>
> When searching for the corresponding hdparm output with X25-M in
> google, I found only hdparm output with this feature unset.
>
> What can I expect with a X25-M on my hardware regarding DIPM? It is a
> ThinkPad X61s, lspci shows this:
>
> 00:1f.2 SATA controller [0106]: Intel Corporation 82801HBM/HEM
> (ICH8M/ICH8M-E) SATA AHCI Controller [8086:2829] (rev 03)
>
> Please CC: me in replies, as I'm not subscribed.

Have a look here:

http://www.thinkwiki.org/wiki/How_to_reduce_power_consumption#SATA_Link_Power_Management

Replace host0, host1, etc. with the appropriate numbers..

Re: Intel X25-M and device-initiated interface power management

[Tino Keitel]

On Tue, Mar 16, 2010 at 18:10:51 -0600, Robert Hancock wrote:

[...]

> Have a look here:
> 
> http://www.thinkwiki.org/wiki/How_to_reduce_power_consumption#SATA_Link_Power_Management
> 
> Replace host0, host1, etc. with the appropriate numbers..

I set it to max_performance for all scsi_host sysfs entries, but the
DIPM feature in hdparm -I was still shown es enabled.  So this can't be
the reason for the disabled DIPM I saw in the google hits.

Regards,
Tino