ATA Tagged Queuing? (2nd attempt to get an answer)

[Jason Henson]

On 03/05/05 05:43:52, Kjell B. wrote:
> I sent the below question a month ago, but received no answer.  
> Therefore, I resend it in the hope of getting one now.
> 
> ----------
> 
> I'm considering turning on Tagged Command Queuing in my ATA system.  
> My
> disks are all Hitachi 7K250 (two HDS722512VLAT80 and one
> HDS722516VLAT80) which according to Hitachi support this feature  
> (queue
> depth = 32).
> 
> However, I read in
> http://lists.freebsd.org/pipermail/freebsd-current/2003-July/007378.html
> that there may be problems doing this and not really improving  
> performance.
> 
> Is that recommendation still valid or should I go for it?
> 
> My uname:
>  [homebell] ~> uname -a
> FreeBSD homebell.dyndns.org 4.10-RELEASE-p2 FreeBSD 4.10-RELEASE-p2  
> #0:
> Mon Oct 18 21:48:34 CEST 2004
> homebell at homebell.dyndns.org:/usr/obj/usr/src/sys/HOMEBELLapmipfw   
> i386
> 
>-- 
> Kjell
> 
> _______________________________________________


Iread some where FreeBSD only supported ibm drives for that, but then  
all support was throuwn out because nobody used it.  If you want  
performance try a NCQ SATA II drive.  If you only have ATA TCQ then get  
a raptor for max performance.  If it is a desktop then leave it off,  
TCQ is a server feature and slows down normal desktop workloads.   
www.storagereview.com