kern/106343: Need SATA NCQ support

[Dieter]

>Number:         106343
>Category:       kern
>Synopsis:       Need SATA NCQ support
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Dec 04 19:30:09 GMT 2006
>Closed-Date:
>Last-Modified:
>Originator:     Dieter
>Release:        6.0
>Organization:
>Environment:
>Description:
atacontrol cap ad4
reports:

Feature                      Support  Enable    Value           Vendor
Native Command Queuing (NCQ)   yes       -      31/0x1F

I have looked in the atacontrol(8) man page, the ata(4) man page,
I grepped all the section 4 & 8 man pages, and I did an online
search, but I cannot find how to turn on SATA NCQ.

Write performance without NCQ is unacceptable.  NCQ would improve
write performance significantly.

It is not obvious if this is "just" a documentation problem,
or if NCQ support needs to be added to the various SATA
controller device drivers. (nforce4 ultra in my case)

atapci1: <nVidia nForce4 SATA150 controller> port 0x9f0-0x9f7,0xbf0-0xbf3,0x970-0x977,0xb70-0xb73,0xcc00-0xcc0f mem 0xfebfb0\
00-0xfebfbfff irq 10 at device 7.0 on pci0
ata2: <ATA channel 0> on atapci1
ad4: 238475MB <Seagate ST3250823AS 3.03> at ata2-master SATA150

>How-To-Repeat:

>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted: