AB287A PCI-X 10 Gigabit Ethernet Card Overview

Product Overview

10 Gigabit Ethernet Link Settings

The timer value is expressed in microseconds and can be in the range {0 - 32000000}. When the value is zero, interrupts are

disabled. The default values are:

Link util : 0 - 5 5 - 25 25 - 70 70 - 100

Frame Count : 32 256 512 512

Timer : 225000

Receive 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}.

The timer value is expressed in microseconds and can be in the range {0 - 32000000}. When the value is zero, interrupts are

disabled. The default values are:

Link util : 0 - 5 5 - 25 25 - 70 70 - 100

Frame Count : 1 64 128 512

Timer : 100

Checksum Offload

Checksum Offload (CKO) is enabled by default; so, there is no need to enable it. CKO is a performance feature that reduces a

system CPU’s burden by offloading computation of the TCP checksum to the network card. The transport layer always

performs checksum validation using a computed checksum regardless of whether CKO is ON or OFF. When CKO is disabled

(OFF), the transport layer will still validate checksums, computing them in the host CPU rather than using an offloaded

computation from the network card.

You can turn CKO ON or OFF for the transmit side or for the receive side of each LAN card.

The transmit side and receive side CKO are ON (enabled) by default. To change the default setting of CKO on each specific 10

GigE LAN card, use an editor such as “vi” to edit the configuration file /etc/rc.config.d/hpixgbeconf. The parameters in the

config file are

• HP_IXGBE_TX_CHECKSUM_OFFLOAD

• HP_IXGBE_RX_CHECKSUM_OFFLOAD

• HP_IXGBE_UDP_MF_CHECKSUM_OFFLOAD

Editing the config file /etc/rc.config.d/hpixgbeconf saves the configuration across reboots.

Alternatively, you can use the lanadmin -X command to temporarily set the ON/OFF value. Using lanadmin, though, will

not preserve the configuration value if the system is rebooted.

You can set a new value temporarily by using the lanadmin - X command. The lanadmin commands are:

lanadmin -X send_cko_on/off ppa and