Messages in this thread | | | From | Benno Senoner <> | Subject | Re: disk corruptions on "tuned" disks Was: APM killing low-latency performance on BX mainboard | Date | Thu, 11 Nov 1999 02:35:40 +0100 |
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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 ?
> 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.
But are you sure that every ATAPI CDROM drive on the planet has this hardware flaw. I stressed my CDROM drives quite a bit, and was unable to lock up the box.
> 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 ?
How is this handled my other OSes ?
> > Promise Ultra66. No DMA on CDROM/DVDs. It just wont work. At all. > > -Dan
PS: why should recent ATAPI CDROM let you set the DMA mode, when they know that it could lead to problems ?
regards, Benno.
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