User`s guide

10 – Windows XP Driver Installation
System Registry Parameters
FC2354601-00 E 10-7
Q
10.5.1
MaximumSGList
Windows XP includes enhanced scatter/gather list support for doing large SCSI I/O
transfers. Windows XP supports up to 256 scatter/gather segments of 4096 bytes
each, allowing transfers up to 1048576 bytes.
NOTE: OEMSETUP.INF automatically updates the registry to support
33 scatter/gather segments. This setting provides the best overall
performance.
To change this value, follow these steps:
1. Click Start, select Run, and open the REGEDT32 program.
2. Select HKEY_LOCAL_MACHINE and follow the tree structure to the
QL2300.SYS driver:
HKEY_LOCAL_MACHINE
SYSTEM
CurrentControlSet
Services
Ql2300
Parameters
Device
3. Double-click MaximumSGList:REG_DWORD:0x21.
4. Enter a value from 16 to 255 (10h to FFh). A value of 255 (FFh) enables the
maximum 1-MB transfer size. Any value above 255 enables 64K transfers. The
default value is 33 (21h).
5. Click OK.
6. Exit the REGEDT32 program, then restart the system.
10.5.2
NumberOfRequests
The NumberOfRequests registry parameter specifies the maximum number of
outstanding requests per adapter. When the QL2300.SYS driver is installed, the
registry is automatically updated with this parameter set to 150 (96h).
CAUTION!
Increasing this parameter above 150 can result in a system failure.
10.5.3
UseSameNN
If you have multiple QLA23xx HBAs on the same system, the driver assigns the
world wide node name obtained from the first HBA to the rest of the HBAs.