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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: jiminy on February 10, 2010, 11:31:49 PM

Title: A3000 w/Zorro II SCSI slower than WD chip
Post by: jiminy on February 10, 2010, 11:31:49 PM
Hi, I've just recently got my A3000D up and running with CV64 and OS3.9... looks great!  But was wondering... I have a GVP HC+8 that I have tested with.  Sysinfo reports it at ~1 MB/s while the internal SCSI connector runs 2.1 MB/s using a couple of different HDs (WD 4360 and an HP 4G).  Does that sound right?  Why so slow?  And I swear when I first got the GVP board it made WB pull up icons noticeably faster, but I can't duplicate that now.  That was a different A3000D, which is now dead.  The GVP card does have the 4.15 rom, which made no difference.  Just wondering what I should expect from it.  Chips are mostly default A3000 - buster 7 ramsey 4 dmac 2 - the WD SCSI chip is 08.
Title: Re: A3000 w/Zorro II SCSI slower than WD chip
Post by: save2600 on February 10, 2010, 11:35:30 PM
Perhaps you had a Buster 9 or 11 in your other A3000. 7 doesn't do DMA. Also, does the HC+ have RAM on it like the A2091 cards are capable of?
Title: Re: A3000 w/Zorro II SCSI slower than WD chip
Post by: jiminy on February 11, 2010, 12:36:53 AM
Quote from: save2600;542580
Perhaps you had a Buster 9 or 11 in your other A3000. 7 doesn't do DMA. Also, does the HC+ have RAM on it like the A2091 cards are capable of?


Yes it has the full 8 meg... I still have the other MB - it is Buster 7 also.  I have a few other Buster 7's, maybe I will try them all...  Could something else be the bottleneck?  I have tried with and w/o the CV64, also two different daughterboards.

Thanks
Title: Re: A3000 w/Zorro II SCSI slower than WD chip
Post by: Zac67 on February 11, 2010, 07:31:43 AM
Quote from: save2600;542580
Perhaps you had a Buster 9 or 11 in your other A3000. 7 doesn't do DMA. Also, does the HC+ have RAM on it like the A2091 cards are capable of?


Zorro II DMA works with all Super Buster revs. Zorro III DMA is the issue, but doesn't count here.

If the GVP uses DMA it'll make a big difference whether expansion RAM is present on it and how the buffer mask is set on the partition (Z2 DMA won't work with 32 bit RAM, so would go to chip RAM otherwise).
Title: Re: A3000 w/Zorro II SCSI slower than WD chip
Post by: jiminy on February 12, 2010, 04:43:02 AM
Quote from: Zac67;542632
Zorro II DMA works with all Super Buster revs. Zorro III DMA is the issue, but doesn't count here.

If the GVP uses DMA it'll make a big difference whether expansion RAM is present on it and how the buffer mask is set on the partition (Z2 DMA won't work with 32 bit RAM, so would go to chip RAM otherwise).


Thanks, I didn't know what the mask was for... it is set to 0xFFFFFE, which is correct, right?  Not sure how the mask is applied... The GVP mem goes $200000 to $9FFFFF.  Also, the internal scsi is now at 2.7 MB/s... could be I hadn't looked at it since installing 3.9.  Is there a way to know exactly what memory is being used for the buffers?