From owner-freebsd-stable  Sun Mar 26 17:43:59 2000
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Date: Sun, 26 Mar 2000 20:44:03 -0500
To: Andrew <acs@fl.net.au>, freebsd-stable@FreeBSD.ORG
From: Mike Tancsa <mike@sentex.net>
Subject: Re: DMA on a UDMA 33 drive
In-Reply-To: <Pine.BSF.4.05.10003271126070.53046-100000@jander.fl.net.au
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At 11:38 AM 3/27/2000 +1000, Andrew wrote:
>Hi,
>
>What is the current status of DMA support? I've always had trouble with it
>and just then I enabled it, caused a lot of disk activity and the machine


I have had good luck with 4.x STABLE and the Intel PIIX4 and various 
Quantum drives.  Dont know how the others fair, but you might search 
through the archives to see

>chip0: <VIA 82C597 (Apollo VP3) system controller> rev 0x04 on pci0.0.0
>chip1: <VIA 82C598MVP (Apollo MVP3) PCI-PCI bridge> rev 0x00 on pci0.1.0
>chip2: <VIA 82C586 PCI-ISA bridge> rev 0x47 on pci0.7.0
>ide_pci0: <VIA 82C586x (Apollo) Bus-master IDE controller> rev 0x06 on 
>pci0.7.1
>chip3: <VIA 82C586B ACPI interface> rev 0x10 on pci0.7.3
>
>Does anyone want me to collect debugging output for them? Would I have
>more luck with 4.0?

Possibly.  From the ata man pages,

      The currently supported controllers with their maximum speed include:

      Acerlabs Aladdin         Ultra DMA 33 (UDMA2), 33 MB/sec
      AMD 756                  Ultra DMA 66 (UDMA4), 66 MB/sec
      HighPoint HPT366         Ultra DMA 66 (UDMA4), 66 MB/sec
      Intel PIIX               DMA 2 (WDMA2), 16 MB/sec
      Intel PIIX3              DMA 2 (WDMA2), 16 MB/sec
      Intel PIIX4              Ultra DMA 33 (UDMA2), 33 MB/sec
      Intel ICH                Ultra DMA 66 (UDMA4), 66 MB/sec
      Promise Fasttrak-33      Ultra DMA 33 (UDMA2), 33 MB/sec
      Promise Fasttrak-66      Ultra DMA 66 (UDMA4), 66 MB/sec
      Promise Ultra-33         Ultra DMA 33 (UDMA2), 33 MB/sec
      Promise Ultra-66         Ultra DMA 66 (UDMA4), 66 MB/sec
      SiS 5591                 Ultra DMA 33 (UDMA2), 33 MB/sec
      VIA 82C586               Ultra DMA 33 (UDMA2), 33 MB/sec
      VIA 82C686               Ultra DMA 66 (UDMA4), 66 MB/sec
      CMD 646                  DMA 2 (WDMA2), 16 MB/sec
      Cypress 82C693           DMA 2 (WDMA2), 16 MB/sec

      All unknown chipsets can be supported at the maximum speed of 16 MB/sec.


         ---Mike



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