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

Thomas Backman serenity at
Tue Dec 15 09:41:56 UTC 2009

On Dec 15, 2009, at 10:36 AM, Wes Peters wrote:

> On Wed, Nov 18, 2009 at 7:46 AM, Norikatsu Shigemura <nork at> 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? :)


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