Date: Mon, 22 Nov 2004 21:54:13 +0100 From: =?ISO-8859-1?Q?S=F8ren_Schmidt?= <sos@DeepCore.dk> To: David Gilbert <dgilbert@dclg.ca> Cc: freebsd-hackers@freebsd.org Subject: Re: List of fake vs. real SATA drives. Message-ID: <41A251F5.9020601@DeepCore.dk> In-Reply-To: <16802.17819.983480.763628@canoe.dclg.ca> References: <16798.12075.465147.307112@canoe.dclg.ca> <864qjixdpi.wl%sf@FreeBSD.org> <41A1FB7D.9000308@jonny.eng.br> <Pine.OSX.4.61.0411221417120.787@oof.local> <41A2444E.2090609@jonny.eng.br> <16802.17819.983480.763628@canoe.dclg.ca>
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David Gilbert wrote: >>>>>>"Jo=E3o" =3D=3D Jo=E3o Carlos Mendes Lu=EDs <jonny@jonny.eng.br> wr= ites: >=20 >=20 > Jo=E3o> IIF they really have command queueing, I do believe. So, a > Jo=E3o> bridged SATA drive will not have command queuing, right? >=20 > Well... from what I've read, the WD bridged drives do have queueing > because they had an ATA-100 implementation of it. >=20 > Jo=E3o> Does FreeBSD already take advantage of this? How could I check= > Jo=E3o> if my SATA drivers have command queueing or not? >=20 > I'd like to know as well. Currently the ATA driver does not support neither TCQ nor NCQ. For this to work at all both disk and controller needs to support the=20 mode in question. I've just gotten my hands on one of the new Promise=20 controllers that supports NCQ, but I still need disks to get it going. I do have a few Raptor's that support the TCQ mode but initial testing=20 shows little benefit from it so it moved to the backburner... --=20 -S=F8ren
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