Date: Wed, 5 Sep 2001 09:56:26 +0200 (CEST) From: Søren Schmidt <sos@freebsd.dk> To: Steve Roome <stephen_roome@yahoo.com> Cc: Niek Bergboer <niek@bergboer.net>, freebsd-hackers@FreeBSD.ORG Subject: Re: Tagged Command Queuing support for IC-35L0?0 ? Message-ID: <200109050756.f857uQM18767@freebsd.dk> In-Reply-To: <20010905003802.A571@dylan.home> "from Steve Roome at Sep 5, 2001 00:38:02 am"
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It seems Steve Roome wrote: > On Tue, Sep 04, 2001 at 07:20:30PM +0200, Niek Bergboer wrote: > > Can these newer drives, based on the IC-35L0?0-chipset, also be used > > with TCQ enabled in FBSD? (? is 2, 4 or 6 depending on whether the > > drive has 20, 40 or 60 GB capacity). Yes, and support has been committed to both -current & -stable. > I've got one of these : > > ad0: 39266MB <IC35L040AVER07-0> [79780/16/63] at ata0-master UDMA66 > > If I turn tagged queueing on, I get an awful lot of write failures and > ata timeouts and whatnot. Basically it just doesn't work. **For me** > > I'm not blaming Søren Schmidt here! it could be due to broken > hardware, code or just my sheer incompetence, but in the end I gave up > trying, it didn't work with my last drive either, and that was a 30GP > type drive (don't remember the model number though). > > As far as I remember there are apparently problems with some of these > drives in terms of whether they even work when they leave the factory, > but I've only ever heard that here (make what you want of that). Well, thanks :) Anyhow, the problem at hand is more like bad chipsets, there is ALOT of ATA chipsets thats not working right when used the way needed for tagged queuing. That said, the IBM DTLA's series of drives are extremely picky about power (that makes them unusable in at least California right :)) which I've seen cause trouble on highly loaded machines. However I run 4 of them here locally with tags, and they get about as much beating as they can handle, not a single error yet, so it definitly works, you just need the right environment for them. So what chipset does you machine have ? that could very well be the problem here. -Søren To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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