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Badly configured pre-built Sam's?
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I forgot to mention this before. Some time ago I found that someone's prebuilt Sam440 system had horrendous MaxTransfer & Mask values set in Media Toolbox.

Specifically, they had a MaxTransfer of "1FE0" (i.e. 130KB!) when it should be "7FFFFFFF". Mask was also set to something odd (can't remember) but it should be "FFFFFFFE". I would expect that such a low Max Transfer value to impact disk performance (increasing CPU usage & slowing disk access speed), although I don't know how badly without testing it, and a small Mask value could also cause problems.

This might have been a one-off or accident, rather that a systematic problem with pre-built systems from the seller (who I do not wish to name). I recommend that other users check their system, and request they report back on what they find.

Author of the PortablE programming language.
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Re: Badly configured pre-built Sam's?
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If you are not sure how to check, then:

1. Start Sys:System/Media Toolbox.
2. Choose sii3114ide.device from the list.
3. Choose "Fixed hard disk" from the list (it should be the first one, which has "0, 0" for "Id, LUN"). MAKE SURE TO CLICK "Edit partitions and filesystems". (If you accidentally chose to edit the RDB instead then you could wipe the entire drive.)
4. You can check a few partitions, but might as well leave the first partition selected for the moment.
5. Click "Select filingsystem/edit details".
6. See what values are written for Maxtransfer & Mask.
7. Cancel the windows when you are finished. WARNING: If you accept any (accidental) changes then you need to be prepared that this could wipe your OS4 system entirely!

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Re: Badly configured pre-built Sam's?
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@ChrisH

Quote:

ChrisH wrote:
I forgot to mention this before. Some time ago I found that someone's prebuilt Sam440 system had horrendous MaxTransfer & Mask values set in Media Toolbox.

Specifically, they had a MaxTransfer of "1FE0" (i.e. 130KB!) when it should be "7FFFFFFF". Mask was also set to something odd (can't remember) but it should be "FFFFFFFE". I would expect that such a low Max Transfer value to impact disk performance (increasing CPU usage & slowing disk access speed), although I don't know how badly without testing it, and a small Mask value could also cause problems.
[/b]


To add to that:

What should the buffers be set to?

I know the block size needs to be set to 512 for sfs/00.

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Re: Badly configured pre-built Sam's?
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@ChrisH

Quote:
Specifically, they had a MaxTransfer of "1FE0" (i.e. 130KB!)
0x1FE0 is even less than 8 KB (7680 bytes), 130 KB would be 0x20800 and couldn't slow down anything even on filesystems which use MaxTransfer.

Quote:
when it should be "7FFFFFFF". Mask was also set to something odd (can't remember) but it should be "FFFFFFFE". I would expect that such a low Max Transfer value to impact disk performance (increasing CPU usage & slowing disk access speed), although I don't know how badly without testing it, and a small Mask value could also cause problems.
It depends on the filesystem, for example my AmigaOS 4.x filesystems don't support these old workarounds for broken drivers (MaxTransfer, Mask and BufMemType) and it doesn't matter what you enter there.

For filesystems still using them the correct values are
MaxTransfer: 0xFFFFFFFF
Mask: 0xFFFFFFFF
BufMemType: 0

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Re: Badly configured pre-built Sam's?
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@joerg Quote:
0x1FE0 is even less than 8 KB (7680 bytes)

Ooops, you are right! I must have typed 1FE00 in the hex->decimal converter. Thought that 130KB sounded a bit large!

Quote:
for example my AmigaOS 4.x filesystems don't support these old workarounds for broken drivers (MaxTransfer, Mask and BufMemType) and it doesn't matter what you enter there.

Does that includes SFS 1?

That would then mean only FFS could be affected. Some systems are still supplied with FFS, heaven knows why, so it could still be a problem (FFS is bad enough on it's own).

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Re: Badly configured pre-built Sam's?
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-- snip-- removed off topic reply about my partition setting on MicroA1


Edited by redfox on 2010/5/15 20:14:03
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Re: Badly configured pre-built Sam's?
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So everyone's Sam are configured fine? (Would be nice if this was true)

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Re: Badly configured pre-built Sam's?
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@ChrisH


My SAM's disk seems to have been pre-configured fine.

The Rear Window blog

AmigaOne X5000 @ 2GHz / 4GB RAM / Radeon RX 560 / ESI Juli@ / AmigaOS 4.1 Final Edition
SAM440ep-flex @ 667MHz / 1GB RAM / Radeon 9250 / AmigaOS 4.1 Final Edition
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Re: Badly configured pre-built Sam's?
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@ChrisH

my main boot partition is SFS/02 with:
max transfer=7FFFFFFF
mask= FFFFFFFE

(also my syetm was put together by myself but the above values were automatically setup by AmigaOS)


Edited by 328gts on 2010/5/17 16:10:56
_______________________________
c64-dual sids, A1000, A1200-060@50, A4000-CSMKIII
Catweasel MK4+= Amazing
! My Master Miggies-Amiga1000 & AmigaONE X1000 !
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Re: Badly configured pre-built Sam's?
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@ChrisH

My Sam was configured perfectly. (I configured it myself.)

Valiant@Camelot
AmigaOne XE, 800Mhz, 1GB, 9250 Radeon, OS4.1u7
Sam440ep, 666Mhz, 512Mb, 9250 Radeon, OS4.1u6
A1-X1000, 1.8Ghz, 1GB, 9250 Radeon, OS4.1x
A1-X5000/40 2.2Ghz, 2GB, Radeon HD 7700, OS4.1 FE ud 2
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Re: Badly configured pre-built Sam's?
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Quote:

Valiant wrote:
@ChrisH

My Sam was configured perfectly. (I configured it myself.)


ya I always build my own systems as thta's half the fun for me but I must admit that Amigakit gave me great support during the setup of my Samflex

_______________________________
c64-dual sids, A1000, A1200-060@50, A4000-CSMKIII
Catweasel MK4+= Amazing
! My Master Miggies-Amiga1000 & AmigaONE X1000 !
mancave-ramblings

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Re: Badly configured pre-built Sam's?
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Quote:

Valiant wrote:
@ChrisH

My Sam was configured perfectly. (I configured it myself.)


me too. btw, i never had this kind of broblems all these years,
even with wb3.1 and hdtoolbox.

A3040/25 AmigaOS 3.2.2 | A1260BPPC AmigaOS 3.2.2/4.0
Sam440ep AmigaOS 4.1.FE | PegasosII/G3 AmigaOS 4.1.FE/MorphOS 3.17
MacMini1.5 MorphOS 3.17

Long Live Amiga
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