Date: Sun, 26 Mar 2000 20:44:03 -0500 From: Mike Tancsa <mike@sentex.net> To: Andrew <acs@fl.net.au>, freebsd-stable@FreeBSD.ORG Subject: Re: DMA on a UDMA 33 drive Message-ID: <4.2.2.20000326204211.0321ba48@mail.sentex.net> 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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