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Date:      Tue, 13 Apr 1999 16:02:19 +0930
From:      Greg Lehey <grog@lemis.com>
To:        Adam Dace <awd@kiwi.pyro.net>
Cc:        rick hamell <hamellr@dsinw.com>, freebsd-questions@FreeBSD.ORG
Subject:   Re: Supported Socket 7 Motherboard UDMA Chipsets ?
Message-ID:  <19990413160219.K74226@lemis.com>
In-Reply-To: <Pine.LNX.4.00.9904130119460.9035-100000@kiwi.pyro.net>; from Adam Dace on Tue, Apr 13, 1999 at 01:24:29AM -0500
References:  <19990413121808.A74226@lemis.com> <Pine.LNX.4.00.9904130119460.9035-100000@kiwi.pyro.net>

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On Tuesday, 13 April 1999 at  1:24:29 -0500, Adam Dace wrote:
> On Tue, 13 Apr 1999, Greg Lehey wrote:
>
>> On Monday, 12 April 1999 at 10:39:32 -0700, rick hamell wrote:
>
>> "*at least*"?  I don't know any SCSI drives which will sustain 30
>> MB/s.
>
> Interesting to note that our big RAID 0+1 array at work only can sustain
> approx 11MB/sec.  Looks to me like UDMA is catching up.  :)

Real-world UDMA transfer rates currently do peak at about 15 MB/s.
It looks like they're catching up.  But not all RAID arrays are
designed for blinding speed.

>> The chip sets for which FreeBSD has specific support are listed in the
>> function ide_pci_probe, in /sys/pci/ide_pci.c.  The following is the
>> listing from 4.0-CURRENT; you'll probably find that one or the other
>> is missing in earlier versions.
>
> I didn't even realize 4.0 was under development.

-CURRENT has been called 4.0 for about 3 months.

Greg
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