Date: Mon, 22 Nov 2004 23:03:25 -0500 From: David Gilbert <dgilbert@dclg.ca> To: =?ISO-8859-1?Q?S=F8ren_Schmidt?= <sos@DeepCore.dk> Cc: David Gilbert <dgilbert@dclg.ca> Subject: Re: List of fake vs. real SATA drives. Message-ID: <16802.46733.409188.353864@canoe.dclg.ca> In-Reply-To: <41A251F5.9020601@DeepCore.dk> 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>
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>>>>> "S=F8ren" =3D=3D S=F8ren Schmidt <sos@DeepCore.dk> writes:
S=F8ren> David Gilbert wrote:
>>>>>>> "Jo=E3o" =3D=3D Jo=E3o Carlos Mendes Lu=EDs <jonny@jonny.eng.br=
> writes:
>>=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.
S=F8ren> Currently the ATA driver does not support neither TCQ nor NCQ.=
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...
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.
--=20
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|David Gilbert, Independent Contractor. | Two things can only be =
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|Mail: dave@daveg.ca | equal if and only if t=
hey |
|http://daveg.ca | are precisely opposit=
e. |
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