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Date: Mon, 22 Nov 2004 21:54:13 +0100
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To: David Gilbert <dgilbert@dclg.ca>
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Subject: Re: List of fake vs. real SATA drives.
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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