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- Path: grapool30.rz.uni-frankfurt.de!news
- From: raftopou@stud.uni-frankfurt.de (Joerg Raftopoulos)
- Newsgroups: comp.sys.amiga.hardware
- Subject: Re: Proper mask, transfer rate, etc.
- Date: 15 Apr 96 15:39:50 +0100
- Organization: J. W. Goethe-Universitaet Frankfurt/Main
- Message-ID: <3043.6679T939T2532@stud.uni-frankfurt.de>
- References: <4k1740$ddo@hobbes.compusult.nf.ca> <4k1lkb$a3j@freenet-news.carleton.ca>
- <2365.6671T6T1540@stud.uni-frankfurt.de> <dalec.06j5@zorro.amitrix.com>
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- DC> In article <2365.6671T6T1540@stud.uni-frankfurt.de> raftopou@stud.uni-fra
- >>
- >> KCL> Mark Worden (mworden@public.compusult.nf.ca) writes:
- >> >>
- >> >> Mask: 0x7ffffffe
- >>
- >> KCL> This tells the file system where data cannot be transfer directly
- >> KCL> driver directly. XXXe means data is word aligned and XXXc means
- >> KCL> long word aligned. So if you set it to long, and your program gi
- >> KCL> word aligned address, the file system have to do an extra level o
- >> KCL> copying, hence slowing it down. Take a lot at the difference of
- >> KCL> your HD performance under long/word/byte aligned tests in DiskSpe
- >>
- >> may i quote from the original post?
- >>
- >> MW> Can anyone tell me what the proper mask, transfer rate, etc. shoul
- >> MW> my A3000 with 100MB Quantum hard drive and a Zip drive? Both driv
- >> MW> been formatted with the Fast File System (I have Workbench v2.1).
- >>
- >> so we are talking about the amiga 3000 scsi dma hostadapter. an extreme
- >> efficient design that has nothing in common with those crappy a1200/400
- >> ide implementations. the correct values are shown in amiga 3000`s manua
- >> edition) in chapter 6 (using a harddisk) on page 66 a screenshot labele
- >> "setting file system characteristics" says: mask = 0xfffffffc and
- >> maxtransfer = 0xffffff
- DC>
- DC> Actually, the 3000 users manual has no such reference. You must be talki
- DC> about the section in the 2.04 Workbench manuals, which pertains to all
- DC> machines, not just the 3000 (BTW, it's section 6-87 in the 2.1 manual).
-
- DC> You're correct about the value shown in the screen shot, it is a "c".
- DC> However, the default value in HDToolBox has always been 0x7ffffffe, up to
- DC> and including 3.1, AFAIK. That is just a couple of bytes shy of 2 Gigs,
- DC> which is the limit of the filesystems addressing. Anything larger is
- DC> invalid. The manual is obviously wrong, and anyway, I'd trust the
- DC> programmers before the manual writer anyday.
-
- DC> As a matter of interest, I once ran some DiskSpeed tests with both a "c"
- DC> and an "e" mask. The differences were so small as to be within the
- DC> variation in numbers between successive tests with no changes. However,
- DC> usual, your mileage may vary, I'll stick with the default, it works.
-
- DC> --
- DC> Cheers,
- DC> ---
- DC> + _ ____________ tm Dale Currie ____ ___ _ +
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- Joerg Raftopoulos, Amiga User since 1987
- 3 x A1000, 1 x A500, 2 x A2000, 1 x A1200, 2 x A3000 Owner
- Student at J. W. Goethe Universitaet, Frankfurt am Main, West Germany, Sol III
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