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>
next in thread | previous in thread | raw e-mail | index | archive | help
David Gilbert wrote: >>>>>>"Søren" == Søren Schmidt <sos@DeepCore.dk> writes: > > > Søren> David Gilbert wrote: > >>>>>>>>"João" == João Carlos Mendes Luís <jonny@jonny.eng.br> writes: >>> >>> >>>João> IIF they really have command queueing, I do believe. So, a >>>João> 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. >>> >>>João> Does FreeBSD already take advantage of this? How could I >>>check João> if my SATA drivers have command queueing or not? >>> >>>I'd like to know as well. > > > Søren> Currently the ATA driver does not support neither TCQ nor NCQ. > > Søren> For this to work at all both disk and controller needs to > Søren> support the mode in question. I've just gotten my hands on one > Søren> of the new Promise controllers that supports NCQ, but I still > Søren> need disks to get it going. I do have a few Raptor's that > Søren> support the TCQ mode but initial testing shows little benefit > Søren> 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. Usually I'd need "hands on" HW for things like this, as there might be alot of resetting/powertoggle in there until things gets twisted the right way, its just so much easier to deal with. Lets see how things turns out, if I cannot get my hands on real disks here in the lab, I'll take you up on the offer.. -- -Søren
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?41A31467.4060400>