- Sun Ethernet Device Driver Product Manual

Setting Parameters 25

Conﬁguring TCP/IP for Maximum Performance

This section describes how to benchmark the TCP/IP throughput and how to

set the TCP/IP hiwater marks for best performance.

▼ To benchmark the TCP/IP throughput

♦ Use the ndd command to conﬁgure the values of some of the TCP

parameters for maximum performance.

▼ To set the TCP hiwater marks for best performance

♦ Type the following ndd commands:

Setting Parameters in the /etc/system File

To conﬁgure the hme driver parameters for all SUNW,hme devices in the system

so that the parameter variables are always effective (even after rebooting the

system), enter the parameter variables in the /etc/system ﬁle. When you

reboot the system, the system reads the /etc/system ﬁle and sets these

parameter variables in the hme module in the operating system kernel.

Table 4-1 lists the variables you need to set in the /etc/system ﬁle.

# ndd -set /dev/tcp tcp_xmit_hiwat 65535

# ndd -set /dev/tcp tcp_recv_hiwat 65535

# ndd -set /dev/tcp tcp_cwnd_max 65534

Table 4-1 Setting Variables in the /etc/system File

Parameter Variable

ipg1 hme_ipg1

ipg2 hme_ipg2

use_int_xcvr hme_use_int_xcvr

pace_size hme_pace_size

adv_autoneg_cap hme_adv_autoneg_cap