Date: Tue, 23 Nov 2004 11:43:51 +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: <41A31467.4060400@DeepCore.dk> In-Reply-To: <16802.46733.409188.353864@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> <41A251F5.9020601@DeepCore.dk> <16802.46733.409188.353864@canoe.dclg.ca>
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David Gilbert wrote: >>>>>>"S=F8ren" =3D=3D S=F8ren Schmidt <sos@DeepCore.dk> writes: >=20 >=20 > S=F8ren> David Gilbert wrote: >=20 >>>>>>>>"Jo=E3o" =3D=3D Jo=E3o Carlos Mendes Lu=EDs <jonny@jonny.eng.br> = writes: >>> >>> >>>Jo=E3o> IIF they really have command queueing, I do believe. So, a >>>Jo=E3o> bridged SATA drive will not have command queuing, right? >>> >>>Well... from what I've read, the WD bridged drives do have queueing >>>because they had an ATA-100 implementation of it. >>> >>>Jo=E3o> Does FreeBSD already take advantage of this? How could I >>>check Jo=E3o> if my SATA drivers have command queueing or not? >>> >>>I'd like to know as well. >=20 >=20 > S=F8ren> Currently the ATA driver does not support neither TCQ nor NCQ.= >=20 > S=F8ren> For this to work at all both disk and controller needs to > S=F8ren> support the mode in question. I've just gotten my hands on one= > S=F8ren> of the new Promise controllers that supports NCQ, but I still > S=F8ren> need disks to get it going. I do have a few Raptor's that > S=F8ren> support the TCQ mode but initial testing shows little benefit > S=F8ren> from it so it moved to the backburner... >=20 > Do you need direct access to a drive or is access to a machine with a > drive/controller in it sufficient. Are promise controllers the only > ones to support NCQ so far? Promise doesn't always have the best > reputation. We may be able to provide a test machine with remote > access to a drive/controller combination. Usually I'd need "hands on" HW for things like this, as there might be=20 alot of resetting/powertoggle in there until things gets twisted the=20 right way, its just so much easier to deal with. Lets see how things=20 turns out, if I cannot get my hands on real disks here in the lab, I'll=20 take you up on the offer.. --=20 -S=F8ren
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