Sun Microsystems 805-7945-10 manual Interpacket Gap Parameters

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Interpacket Gap Parameters

The GEM ASIC supports the programmable Interpacket Gap (IPG) parameters ipg1 and ipg2. The total IPG is the sum of ipg1 and ipg2: 0.096 microseconds for the link speed of 1000 Mbps.

TABLE 4 lists the default values and allowable values for the IPG parameters, ipg1 and ipg2.

TABLE 4

Read-Write Interpacket Gap Parameter Values and Descriptions

 

 

 

Parameter

Values

Description

 

(Byte-time)

 

 

 

 

ipg1

0, 255

ipg1 = 8 (default at initialization)

ipg2

0, 255

ipg2 = 4 (default at initialization)

 

 

 

By default, the driver sets ipg1 to 8-byte time and ipg2 to 4-byte time, which are the standard values. (Byte time is the time it takes to transmit one byte on the link, with a link speed of 1000 Mbps.)

If your network has systems that use longer IPG (the sum of ipg1 and ipg2) and if those machines seem to be slow in accessing the network, increase the values of ipg1 and ipg2 to match the longer IPGs of other machines.

Defining an Additional Delay Before Transmitting a Packet Using lance_mode and ipg0

The GEM ASIC supports a programmable mode called lance_mode. The ipg0 parameter is associated with lance_mode.

If lance_mode is enabled (the default), an additional delay is added by setting the ipg0 parameter before transmitting the packet. This delay is in addition to the delay set by the ipg1 and ipg2 parameters. The additional delay set by ipg0 helps to reduce collisions. Systems that have lance_mode enabled might not have enough transmission time on the network.

If lance_mode is disabled, the value of ipg0 is ignored and no additional delay is set. Only the delays set by ipg1 and ipg2 are used. Disable lance_mode if other systems keep sending a large number of back-to-back packets.

You can add the additional delay by setting the ipg0 parameter from 0 to 31, which is the media byte time delay.

Installing and Configuring the ge Device Driver 7

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Contents Solaris Please Recycle Contents To Use the ndd Utility in Non-Interactive Mode Become superuser Installing the Driver SoftwareTo Install the Driver Software Install the software Set Up the Software on Solaris Systems# grep ge /etc/pathtoinst /pci@1f,4000/pci@1/network@1 1 ge GigabitEthernet MAC Configuring the Driver ParametersGe Driver Parameters, Status, and Descriptions Driver Parameter Values and DefinitionsRead-Write Flow Control Parameters Values and Descriptions Defining the Current StatusFlow Control Parameters Read-Only Parameters Defining the Current StatusInterpacket Gap Parameters Parameters Defining lancemode and ipg0 Operational Mode ParametersOperational Mode Parameters Read-Only Link Partner Capabilities Reporting Local PCS CapabilitiesReporting the Link Partner Capabilities Read-Only PCS CapabilitiesSetting Parameters Using the ndd Utility Setting ge Driver ParametersUse the instance number to select the device To Specify the Device Instance for the ndd UtilityNon-Interactive and Interactive Modes To modify a parameter value, use the -setoption To Use the ndd Utility in Non-Interactive ModeTo Use the ndd Utility in Interactive Mode To View the ge Driver ParametersTo Set Autonegotiation to Off Forced Mode Autonegotiation ModeUnderstanding the ge.conf File Setting Parameters Using the ge.conf FileTo Set Parameters Using the ge.conf File on an SBus adapter To Set Parameters Using the ge.conf File on a PCI adapter Network ConfigurationTo Configure the Host Files Etc/hostname.ge1 To Set Up a Diskless Client on a Server # grep clientname /etc/bootparams At the ok prompt, type

805-7945-10 specifications

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