How do I use NCQ of Intel X25-E(SSD) on ahci(4)?

[Wes Peters]

On Wed, Nov 18, 2009 at 7:46 AM, Norikatsu Shigemura <nork at freebsd.org> wrote:
> Hi Alexander!
>
>        I have a Intel 64GB SSD(X25-E) and a Western Digital Caviar Green
>        1TB HDD (WD10EADS), and use them on ahci(4).  ahci(4) can use NCQ
>        of WD10EADS, but doesn't use NCQ of X25-E.

How useful is NCQ on an SSD?  Isn't the primary thrust of NCQ to allow
the disk to reorder writes to optimize the seek pattern?

-- 
Against stupidity the very gods Themselves contend in vain.
                                         Friedrich Schiller