Date: Mon, 22 Nov 2004 21:54:13 +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: <41A251F5.9020601@DeepCore.dk> In-Reply-To: <16802.17819.983480.763628@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>
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David Gilbert wrote: >>>>>>"Joćo" == Joćo Carlos Mendes Luķs <jonny@jonny.eng.br> writes: > > > Joćo> IIF they really have command queueing, I do believe. So, a > Joćo> 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. > > Joćo> Does FreeBSD already take advantage of this? How could I check > Joćo> if my SATA drivers have command queueing or not? > > 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 mode in question. I've just gotten my hands on one of the new Promise 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 shows little benefit from it so it moved to the backburner... -- -Sųren
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