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7–Windows Server 2003, 2008, and 2008 R2 Driver Configuration
Windows Server 2003 Performance
7-16 NE0154601-00 C
Tcp1323Opts Parameter
This parameter determines whether TCP uses the time-stamping and window
scaling features described in RFC 1323, TCP Extensions for High Performance.
For more efficient use of high bandwidth networks, use a larger TCP window size.
The TCP window size field controls the flow of data and is limited to 2 bytes, or a
window size of 65,535 bytes.
Since the size field cannot be expanded, a scaling factor is used. The TCP
window option increases the maximum window size from 65,535 bytes to
1 gigabyte. The TCP receive window is the amount of data the sending host can
send on a connection at one time.
When the value for window size is added to the registry and its size is larger than
the default value, Windows attempts to use a scale value that accommodates the
new window size.
Tables 7-3 and 7-4 show the four Tcp1323Opts settings.
-fr
— Full buffers posted on read opera-
tions.
-mb
— Multiple buffer post mode
-m <mapping>
— mapping is a session or sessions,
processor, receiver, and IP set. The
following example sets up four ses-
sions on processor 0 to test a net-
work on 1.2.3.4:
-m 4,0,1.2.3.4
NOTE:
This parameter is only for Windows Server 2003.
Table 7-3. Tcp1323Opts
Data Type
Range
a
a
See Table 7-4
Value
REG_DWORD 0 | 1 | 2 | 3 1
Table 7-2. ntttcps and ntttcpr Command Line Options (Continued)
Command Default Notes