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

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

> 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?
http://en.wikipedia.org/wiki/NCQ#NCQ_in_Solid-State_Drives :)

Regards,
Thmas