Ethernet Support Guide for HP-UX 11i v3

Example 21 Displaying current TCP segment reassembly parameter values
To determine the current TCP segment reassembly settings, enter the following command:
nwmgr -g -A drv_pr -c lanppa
Example 22 Setting TCP segment reassembly
To set the TCP segment reassembly option permanently so that it is saved across reboots, edit the
driver's configuration file to set the appropriate parameter value to ON or OFF.
The name of the configuration file parameter that sets TCP segment reassembly varies from driver
to driver. (The nwmgr parameter is drv_pr for all supporting drivers. ) Table 13 (page 36) lists
the configuration file parameter name for each driver that supports the feature.
Table 13 Configuration file parameter name for setting TCP segment reassembly (supported drivers
only)
Parameter nameDriver
HP_IXGBE_DRV_PRixgbe
HP_ICXGBE_LROicxgbe
HP_IEXGBE_SW_LROiexgbe
HP_IOCXGBE_DRV_PRiocxgbe
For example, to enable TCP segment reassembly for the iocxgbe driver, edit the configuration
file /etc/rc.config.d/hpiocxgbeconf to specify the parameter as follows:
HP_IOCXGBE_DRV_PR=ON parameter.
Alternatively, you can also use the nwmgr command with the --sa option to immediately and
permanently set TCP segment reassembly. Set the parameter drv_pr to ON or OFF. Specify the
command in the following format:
nwmgr --sa -A drv_pr={on|off} -c lanppa
TCP segment reassembly is not supported by the Gigabit drivers. For most drivers that support TCP
segment reassembly, the default is OFF. The default for the iocxgbe driver is ON. The default for
the iexgbe driver is ON as of B.11.31.1109; the default for earlier versions is OFF.
NOTE: To turn on TCP segment reassembly, the CKO receive (rx_cko, HP_driver_RECV_CKO)
parameter must be set to ON, and Jumbo Frames must be disabled.
For details about TCP segment reassembly parameter settings, refer to the appropriate
nwmgr_driver(1m) manpage.
3.12 Other parameters
A variety of other parameters are available, many of which are device-specific. Table 14 (page 36)
briefly describes some of these parameters. For details about these and other parameters, refer to
the appropriate nwmgr_driver(1m) manpage.
Table 14 Some other parameters that might be settable and are device-specific
Supporting driversDescriptionParameter
ixgbe (AD385 cards only)Enables or disables 4-tuple hash-based
steering.
4-tuple
ixgbeFrame count for Interrupt coalescing,
specified individually for receive and
transmit.
Coalescing frame count
36 Setting and displaying driver Ethernet parameters