Date: Sun, 06 Mar 2005 17:59:15 +0000 From: Jason Henson <jason@ec.rr.com> To: freebsd-questions@freebsd.org Subject: Re: ATA Tagged Queuing? (2nd attempt to get an answer) Message-ID: <1110131955l.43716l.0l@BARTON> In-Reply-To: <42298D68.705@telia.com> (from homebell@telia.com on Sat Mar 5 05:43:52 2005) References: <42298D68.705@telia.com>
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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@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.comhome | help
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