Tweak Intel's SATA/AHCI Driver parameters?

[GrofLuigi]

I don't have any problem with the driver. Just looking at the parameters I wondered if I can squeeze any more speed or obtain more efficient power management from the driver.

Usually they are found here:

REGEDIT4

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\iaStor\Parameters]
"BusType"=dword:00000003
"queuePriorityEnable"=dword:00000000

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\iaStor\Parameters\Port0]
"AN"=dword:00000000
"DIPM"=dword:00000001
"GTF"=dword:00000001
"LPM"=dword:00000001
"LPMDSTATE"=dword:00000001
"LPMSTATE"=dword:00000000

(repeating afterwards with Port1, Port2 etc.) Maybe someone will notice I have changed from the defaults* and this configuration is working well.

They are not explained in the inf file. Does anyone have explanation of what they do? I think I discovered some of them (and the explanations on Wikipedia), but under what conditions they should be set/cleared?

LPM = Link Power Management

AN = (SCSI) Asynchronous (Event) Notification

DIPM = Device Initiated Power Management

Internet search doesn't yield anything useful besides directions for integration and this Intel's knowledge base. But, for instance, I have Mobile controller so I think it doesn't apply for me.

And I don't think they depend on the Operating System (they are installed on all).

I would be grateful if someone can give more insight about these parameters.

GL

* Edit: No I haven't. I checked again and previously I was looking at desktop parameters, for mobile these are the exact parameters in the inf file.

Edited January 21, 2009 by GrofLuigi

[GrofLuigi]

Is this the Priority Queue? (previously I searched for queuePriority)

Does it have something to do with NCQ (I couldn't quite understand from the paper).

Should it be disabled in pre-Vista?

GL

Edited January 21, 2009 by GrofLuigi