Post-Installation Procedures (Optional); Configuring Driver Parameters; Increasing Tcp/Ip Performance - Sun Microsystems Quad FastEthernet Installation And User Manual

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Post-Installation Procedures (Optional)

Configuring Driver Parameters

Increasing TCP/IP Performance

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Perform the tasks in the following sections to verify and customize the
performance of the Sun Quad FastEthernet SBus Adapter.
The hme device driver, which is loaded from the CD-ROM, controls the
SUNW,hme Ethernet devices. The device driver automatically selects the link
speed using the auto-negotiation protocol with the link partner. (See "Auto-
Negotiation" on page 28.)
You can manually configure the hme device driver parameters to customize
each SUNW,hme device in your system in one of three ways:
•
Configure the hme driver parameters generally for all SUNW,hme devices in
the system by entering the parameter variables in the /etc/system file.
•
Set a parameter on a per-device basis by creating the hme.conf file in the
/kernel/drv directory.
•
Use the ndd utility to temporarily change a parameter. This change is lost
when you reboot the system.
Refer to the Platform Notes: The hme Fast Ethernet Device Driver document for
more information.
The TCP/IP performance of the Sun Quad FastEthernet SBus Adapter can be
increased by changing the TCP high water mark to 64K. This can be done with
the ndd utility as follows.
1. As superuser (root), type:
# ndd -set /dev/tcp tcp_xmit_hiwat 65535
# ndd -set /dev/tcp tcp_recv_hiwat 65535
# ndd -set /dev/tcp tcp_cwnd_max 65534
The changes take effect immediately and affect all the networking interfaces
in the system.
Sun Quad FastEthernet SBus Adapter Installation and User's Guide—April 1997