Path: utzoo!attcan!uunet!lll-winken!csd4.csd.uwm.edu!uakari.primate.wisc.edu!indri!aplcen!jhunix!barrett
From: barrett@jhunix.HCF.JHU.EDU (Dan Barrett)
Newsgroups: comp.sys.amiga
Subject: Re: C-ltd controller
Keywords: hard disk controllers
Message-ID: <2354@jhunix.HCF.JHU.EDU>
Date: 24 Aug 89 14:23:59 GMT
References: <179@gcrc.aecom.YU.EDU> <288@bilver.UUCP>
Reply-To: barrett@jhunix.UUCP (Dan Barrett)
Organization: The Johns Hopkins University - HCF
Lines: 35

In article <288@bilver.UUCP> alj@.UUCP () writes:
>
> Speaking of the new C. Ltd Kronos controller ("Quotes, what quotes?")...
> Regardless, my times (diskperf v3.0) are around 70K read with a 1024 buffer,
>and 54K write.  Are you sure your read time (680K) is correct?
>Given, my drive is an Adaptec 4070 controlled model with an unknown access
>time (10 seconds :) ), bought from C. Ltd. ages (about a year and a half)
>ago, but those times are still disappointingly slow.

	I have an old C.Ltd. controller, Adaptec 4070, and slow 65ms-access
hard drive.  My reads are easily 140Kb/sec.
	Are you using the fast filesystem?

> Oh, these incredibly-fast times are realized with an interleave of four
>(for the Adaptec), turning on all the BlockReads/BlockWrites, and worst of
>all, disabling IRQ interrupts....

	Read the manual carefully.  My interleave is at 5, which is the
recommended interleave on the 4070-based drives.  C.Ltd. controllers tend to
be VERY interleave-sensitive.  Also, I recall that certain options in the
devs:DevSetup file must NOT be turned on with the 4070.  I forget which
ones, but they are clearly marked in the example DevSetups in the manual.

	Hope this helps.

                                                        Dan

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