From owner-freebsd-hackers@FreeBSD.ORG Tue Nov 23 10:44:09 2004 Return-Path: Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 4768516A4CE; Tue, 23 Nov 2004 10:44:09 +0000 (GMT) Received: from spider.deepcore.dk (cpe.atm2-0-53484.0x50a6c9a6.abnxx9.customer.tele.dk [80.166.201.166]) by mx1.FreeBSD.org (Postfix) with ESMTP id 6E56043D58; Tue, 23 Nov 2004 10:44:08 +0000 (GMT) (envelope-from sos@DeepCore.dk) Received: from [194.192.25.143] (laptop.deepcore.dk [194.192.25.143]) by spider.deepcore.dk (8.12.11/8.12.10) with ESMTP id iANAhuYD079619; Tue, 23 Nov 2004 11:43:58 +0100 (CET) (envelope-from sos@DeepCore.dk) Message-ID: <41A31467.4060400@DeepCore.dk> Date: Tue, 23 Nov 2004 11:43:51 +0100 From: =?ISO-8859-1?Q?S=F8ren_Schmidt?= User-Agent: Mozilla Thunderbird 0.7.2 (X11/20040802) X-Accept-Language: en-us, en MIME-Version: 1.0 To: David Gilbert References: <16798.12075.465147.307112@canoe.dclg.ca> <864qjixdpi.wl%sf@FreeBSD.org> <41A1FB7D.9000308@jonny.eng.br> <41A2444E.2090609@jonny.eng.br> <16802.17819.983480.763628@canoe.dclg.ca> <41A251F5.9020601@DeepCore.dk> <16802.46733.409188.353864@canoe.dclg.ca> In-Reply-To: <16802.46733.409188.353864@canoe.dclg.ca> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: quoted-printable X-mail-scanned: by DeepCore Virus & Spam killer v1.4 cc: FUJISHIMA Satsuki cc: Charles Sprickman cc: Mike Geiger cc: =?ISO-8859-1?Q?Jo=E3o_Carlos_Mendes_L?= =?ISO-8859-1?Q?u=EDs?= cc: freebsd-hackers@freebsd.org Subject: Re: List of fake vs. real SATA drives. X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 23 Nov 2004 10:44:09 -0000 David Gilbert wrote: >>>>>>"S=F8ren" =3D=3D S=F8ren Schmidt writes: >=20 >=20 > S=F8ren> David Gilbert wrote: >=20 >>>>>>>>"Jo=E3o" =3D=3D Jo=E3o Carlos Mendes Lu=EDs = 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