Subject: Re: de0/pciide0 performance conflict?
To: Adam Glass \(Exchange\) <>
From: Allen Briggs <>
List: port-i386
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
any ideas?

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.