Date: Wed, 21 Aug 1996 21:13:13 +0200 (MET DST) From: Stefan Esser <se@zpr.uni-koeln.de> To: "Michael L. VanLoon -- HeadCandy.com" <michaelv@HeadCandy.com> Cc: "Rodney W. Grimes" <rgrimes@gndrsh.aac.dev.com>, jas@flyingfox.com (Jim Shankland), freebsd-hardware@FreeBSD.ORG Subject: Re: SCSI again: Asus SC200 vs. Adaptec 2940 Message-ID: <199608211913.VAA04328@x14.mi.uni-koeln.de> In-Reply-To: <199608210056.RAA10672@MindBender.HeadCandy.com> References: <199608202303.QAA08500@GndRsh.aac.dev.com> <199608210056.RAA10672@MindBender.HeadCandy.com>
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Michael L. VanLoon writes: > However, if you enable tagged-command-queuing in the Adaptec driver, > the performance increase is *very* substantial, at least in my tests. > Since the BusLogic doesn't currently have tagged-command-queuing in > the bt driver, it loses this particular point. (But remember, your > drives have to support it correctly, as well -- there are some older > SCSI drives out there that don't support, or have buggy support. > Hopefully all current drives on the market have decent support for > it.) > > I don't know if the NCR has tagged-command-queuing support or not. If > it did, I don't think I would trust it (the NCR driver is OK for > workstation type stuff, as Justin pointed out, but it is known to be > buggier than either the BusLogic or Adaptec drivers). Hmmm, thanks. Yes, the NCR driver has Tagged Command Queuing Support since its earliest days (for more than one and a half year now). It was the only controller that enabled it by default, and we identified a few disk drives that have broken firmware (with the HP 3724 and 3725 being the only current generation drives affected). > >I do have to say that I have an order of magnitude more trust in the > >aha2940 driver, and on my ability to get a bug fixed when I need it > >(Hi Justin! Thanks for the _GREAT_ support!!) by sending the broken > >hardware to Justin and giving him some time to work on it. Well, that really would help ... Why did I never receive a single piece of broken hardware to be able to reproduce a problem somebody sees with a single disk, tape or CDROM drive. This makes me wonder (again), whether I really should spend $1000 on the necessary hardware, and time worth some $10000 or more (if I spent it on paid work) just to allow other people to use the latest 53c8xx variants (Ultra-WIDE), who then complain about a NCR driver bug, whenever some VM system tuning introduces temporal instability :) Regards, STefan
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