How to enable NCQ on freebsd 8.1 ?

Jerry Bell jerry at
Tue Jul 27 17:27:31 UTC 2010

  I believe you need to use AHCI.  I recently moved a test system over 
to AHCI and this is what I see at boot time for my hard drive:
ada0 at ahcich0 bus 0 scbus0 target 0 lun 0
ada0: <ST31000528AS CC34> ATA-8 SATA 2.x device
ada0: 300.000MB/s transfers (SATA 2.x, UDMA6, PIO 8192bytes)
ada0: Command Queueing enabled
ada0: 953869MB (1953525168 512 byte sectors: 16H 63S/T 16383C)



On 7/27/2010 12:47 PM, Nickolay Krylov wrote:
> Hi, all.
> I have enabled "options ATA_CAM" in the generic kernel and now can't understand
> NCQ works or not.

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