AB287A PCI-X 10 Gigabit Ethernet Card Overview

Product Overview

10 Gigabit Ethernet Link Settings

Driver Tunable Settings Explained

Transmit Flow Control -- When enabled, the card will honour PAUSE frames received from the link partner and pause

transmission for the duration of time specified in the PAUSE Frame. When off, the card will ignore PAUSE frames and

continue transmission. The range of values is: {on, off}. Default value: On.

Receive Flow Control -- When enabled, the card will generate PAUSE frames whenever the received frames in the FIFO have

exceeded a certain threshold. When disabled, the card will not generate PAUSE frames. The range of values supported is: {on,

off}. Default value: On.

Receive Flow Control Threshold -- The threshold of the Receive FIFO at which the NIC will send PAUSE frames to the Link

Partner. It is expressed as a percentage of the total FIFO size. The range of values supported is: {0 - 100}. The default value is

75%.

Transmit Interrupt Coalescing -- The 10 GigE card provides four link-utilization ranges, corresponding frame counts, and

also a timer. Based on the utilization range, an interrupt will be generated after a specified number of frames have been

processed by the card. The link utilization ranges and the frame counts are programmable. You can specify three range limits

(Range R1, Range R2, and Range R3) that provide four utilization ranges as indicated below. Please note that the link

utilization is expressed as a percentage. Corresponding to each range, we have frame counts: FRC-A, FRC-B, FRC-C, FRC-D.

Here are the ranges:

Range-A 0 - R1% FRC-A

Range-B R1 - R2% FRC-B

Range-C R2 - R3% FRC-C

Range-D R3 - 100% FRC-D

For the frame counts, the range of values is {0 - 65535}.

-x speed Displays the speed and duplexity of the link. The card always operates at 10Gbits/s, full

duplex mode. Autonegotiation is also not supported.

-X stats clear Clears all driver and adapter statistics.

-x stats drv Displays all driver and adapter statistics.

-X udpmf_cko_on Enables hardware checksum offload for Multifragment UDP (IPv4). It controls both transmit

and receive paths. It is valid only when send and receive cko are enabled. Default: On.

-X udpmf_cko_off Disables hardware checksum offload for Multifragment UDP (IPv4).It controls both transmit

and receive paths. It is valid only when send and receive cko are enabled. Default: On.

-x vmtu ppa Displays the value of the virtual MTU for TCP Segmentation Offload (TSO). For details, see

TCP Segmentation Offload. Default: On.

-X vmtu

new_vmtu_value ppa

Sets the TSO vmtu value. For details, see TCP Segmentation Offload. Default: On.

* These options require the desired value to be specified after the option name. Some of these values may vary due to

performance tuning efforts. See the Performance and Tuning Considerations section of the Ethernet Support Guide for

more information.

Table 2 Link Card Parameters that lanadmin can Display (-x) or Set (-X) (Continued)

Option Setting