Subject: Re: de0/pciide0 performance conflict?
To: Adam Glass \(Exchange\) <adamg@Exchange.Microsoft.com>
From: Allen Briggs <firstname.lastname@example.org>
Date: 10/05/1999 08:50:44
> Generally this is not a parameter that an OS should screw with.
> Theoretically these parameters are balanced by the bios to reflect a latency
> appropriate to the number/type devices in the system. No MS OS modifies
> this parameter. You'll get some performance this way but you might starve
> something else.
I don't doubt it. I was fooling with it mainly to see if it did make
any difference. I don't really know what to try since this behavior
seems so odd. It seems that _something_ isn't configured right and I
don't know how to go about figuring out what it could be. Do you have
The only PnP configuration I have is "Resources controlled by" with
values "Auto/Manual". I have it set to "Auto", which is supposed to
mean that the "system" (BIOS, I presume) will set it up. If it's
switched to "Manual", then I can set the IRQ and DMA to either "Legacy
ISA" or "PCI/ISA PnP". I have no ISA cards in the system. I have one
PCI Trident video card, one PCI Netgear 10/100 card, and one PCI Asus
SCSI card. It's a pretty basic system.
It seems like it must be something glaring to kill performance this
badly, but I don't know enough about the PC/PCI/DMA/bus architecture
to make even a reasonable hypothesis. All I know is that if I take
the pciide drive out and use a SCSI disk, it'll probably run just fine,
but that doesn't solve the problem. It also doesn't explain why M.
Bouyer's Very Similar System runs perfectly well.