
                ExpressPCI Windows Registry Settings
                ---------- ------- -------- --------

CAUTION - Modifying your registry incorrectly may result in making your machine
unbootable.  Please use care in editing the registry.  This should only be
performed by users experienced with the registry editor.

NOTE - Some of the following requires knowledge of hexadecimal arithmetic and
a sense for basic SCSI command processing.  For most users, the defaults
set by the adapter driver installation .INF file will suffice.  "If it ain't
broke, don't fix it!"

The following registry entries are located in the registry key
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Express2\Parameters\ATTO:

PCILatency -		Specifies the PCI Latency Timer value in units of PCI
			bus clocks.  Values can range from 1 - 248 (0x01 - 0xf8).
			The default value is 248. 

NumberOfRequests - 	Specifies the number of buffers the driver allocates
			per adapter channel to process SCSI commands.  Values 
			can range from 256 - 2048 (0x100 - 0x800).  The default 
			value is 512.  Increasing this value may improve 
			performance when doing heavy I/O to several devices on
			one channel.  However, the memory is allocated from 
			non-paged memory, a critical resource for Windows.

NumberOfReplies - 	Specifies the number of buffers the driver allocates
			per adapter channel to process unsuccessful SCSI commands.
			Values can range from 16 - 128 (0x10 - 0x80).  The 
			default value is 16 (one per target ID).

	-----------------------------------------------------------------

