Driver Parameters for Linux Systems

TABLE 5-1lists the tunable ixgbe driver parameters for Linux operating systems and describes their function.

TABLE 5-1Tunable ixgbe Driver Parameters for Linux Operating Systems

Keyword

Valid Range

Default Value

Description

 

 

 

 

FlowControl

0 to 3

Read from the

 

(0=none, 1=Rx

EEPROM.

 

only, 2=Tx only,

If EEPROM is not

 

3=Rx and Tx)

detected, default

 

 

is 3.

This parameter controls the automatic generation (Tx) and response (Rx) to Ethernet PAUSE frames.

RxDescriptiors

64 to 512

512

This value is the number of receive descriptors

 

 

 

allocated by the driver. Increasing this value

 

 

 

allows the driver to buffer more incoming

 

 

 

packets. Each descriptor is 16 bytes. A receive

 

 

 

buffer is also allocated for each descriptor and

 

 

 

can be either 2048, 4056, 8192, or 16384 bytes,

 

 

 

depending on the MTU setting. When the MTU

 

 

 

size is 1500 or less, the receive buffer size is

 

 

 

2048 bytes. When the MTU is greater than 1500,

 

 

 

the receive buffer size will be either 4056, 8192,

 

 

 

or 16384 bytes. The maximum MTU size is

 

 

 

16114.

RxIntDelay

0 to 65535

72

This value delays the generation of receive

 

(0=off)

 

interrupts in units of 0.8192 microseconds.

 

 

 

Receive interrupt reduction can improve CPU

 

 

 

efficiency if properly tuned for specific network

 

 

 

traffic. Increasing this value adds extra latency

 

 

 

to frame reception and can end up decreasing

 

 

 

the throughput of TCP traffic. If the system is

 

 

 

reporting dropped receives, this value might be

 

 

 

set too high, causing the driver to run out of

 

 

 

available receive descriptors.

TxDescriptors

80 to 4096

256

This value is the number of transmit descriptors

 

 

 

allocated by the driver. Increasing this value

 

 

 

allows the driver to queue more transmits. Each

 

 

 

descriptor is 16 bytes.

XsumRX

0 to 1

1

A value of 1 indicates that the driver should

 

 

 

enable IP checksum offload for received packets

(both UDP and TCP) to the Ethernet adapter hardware.

24 Sun Dual 10GbE SFP+ PCIe ExpressModule User’s Guide • August 2008

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Sun Microsystems 5945532 manual Driver Parameters for Linux Systems, Eeprom
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5945532 specifications

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