Path: utzoo!attcan!uunet!super!udel!gatech!hubcap!disd
From: disd@hubcap.UUCP (Gary Heffelfinger)
Newsgroups: comp.sys.amiga.tech
Subject: Re: FFS: The beating goes on...
Message-ID: <4141@hubcap.UUCP>
Date: 19 Jan 89 18:24:58 GMT
References: <7086@pyr.gatech.EDU>
Organization: Clemson University, Clemson, SC
Lines: 97

From article <7086@pyr.gatech.EDU>, by dsking@pyr.gatech.EDU ( David King):
> In article <695@ibmpa.UUCP> saare@ibmpa.UUCP (John Saare) writes:
> ...
>>    - Has anybody experienced throughput problems with the Overdrive/Adaptec
>>      4000a combo?  Any solutions? 
> 
> 
> PROBLEMS: When I first brought up w3FFS{ I followed the instructions in the 
> 	1.3 manual which did not have the Mask parameter.  Found heavy data
> 	corruption.  Called up Pacific Per. They sent me the latest version 
> 	of the software.{ ~rI brought FFS up follwing that and had no 
> 	problems.  I noticed that it was slow, so I hunted down DiskPerf.
> 	Had the exact same problem (27,502 kbytes on all buffers).
> 	However, I have had no other problems with bad blocks.  In fact, I used 
> 	the slow FFS configuration for the past 3 months as I have tried 
> 	various solutions.  
> 
> So here's the question:  How many people have this problem?  What do we have 
> 	in common? Here's my mountlist:

Hooboy, does this sound familiar.


My setup:
b2000 rev 4.(3 or 4)
No extra memory
PP Overdrive with Seagate ST157N affixed.





I have run the PP low-level format with a 1:1 interlace specified.





> ----
> /* OverDrive Drive definition */
> 
> /* FUJI  FK308S-39R */
> 

[Part of mountlist deleted]

> /* The following are the OverDrive's parameters for the FastFileSystem */
> /* CAUTION:: Refer to the Documentation before attempting to use */
> /*           the OverDrive with the FastFileSystem. */
> /* Comment ON */
>    GlobVec = -1
>    FileSystem = l:FastFileSystem
>    Mount = 0
>    Mask = 0x3fffff
>    Stacksize = 0x800
>    MaxTransfer = 127000
> /*   Comment OFF */
> #

Have you tried removing the Mask parm?  That way the device can directly
access any memory.  A month or so ago I removed the Mask, and used a
maxtransfer rate of about 16K and got great speed.  Then I started
seeing gurus when certain programs loaded.  So I bumped the Maxtransfer
rate down, and down, and down, until the gurus stopped.  The number, you
ask.  512.  One lousy block.  The Overdrive software I have appears to
be unable to handle the high rates of the FFS.  I talked to PP once, but
haven't followed up.  Give it a try on your system, and see if your's
does any better.










Gary








 





-- 
Gary R Heffelfinger   -  Not speaking for Clemson University           
disd@hubcap.clemson.edu       -- FIX the Holodeck --
       Furman Paladins --- National Champs!!