Messages in this thread | | | Date | Wed, 10 Nov 1999 18:00:30 -0800 (PST) | From | Dan Hollis <> | Subject | Re: disk corruptions on "tuned" disks Was: APM killing low-latency performance on BX mainboard |
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On Thu, 11 Nov 1999, Benno Senoner wrote: > On Thu, 11 Nov 1999, Dan Hollis wrote: > > On Thu, 11 Nov 1999, Benno Senoner wrote: > > > It would be nice if we could collect some data about problematic > > > drives / mainboards. > > > Alan any know drives ? > > > ( If I get some data I will write a little tool which automates this) > > VIA VP3/MVP3/MVP4 chipets. > thanks, but what is the exact problem source , DMA or unmask IRQ ?
DMA
> > Put any CDROM/DVD in DMA mode and it will work > > for a while and then eventually lock the PC up. This is a hardware flaw. > Doh ! really bad news :-( > What about watching DVDs ? > I'm watching DVDs on windoze using a software-only player, > and without DMA you get nast frameskips ,because the PIO > transfer uses too much CPU. > I'm watching DVDs for hours ( DMA enabled) without any lockups.
It may be ultra dma only bug. Im not sure. My DVDROM and CDROM both support udma.
> But are you sure that every ATAPI CDROM drive on the planet > has this hardware flaw.
Its the controller not the CDROM at fault
> I stressed my CDROM drives quite a bit, and was unable to lock up the box.
What controller and what drives
> > There is no known software workaround. This is not the ISA DMA bug either. > > This is a completely different bug. > Interesting, any pointers for more accurate infos on this topics ?
All the articles on this have long since expired from altavista :-)
> How is this handled my other OSes ?
They dont run DMA.
> > Promise Ultra66. No DMA on CDROM/DVDs. It just wont work. At all. > PS: why should recent ATAPI CDROM let you set the DMA mode, when they > know that it could lead to problems ?
Its the controller not the CDROM at fault
-Dan
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