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Setting parameters in the /etc/system file, Configuring tcp/ip for maximum performance – Sun Microsystems Ethernet Device Driver none User Manual

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Setting Parameters

25

4

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