Dell Broadcom NetXtreme Family of Adapters Betriebsanweisung PDF herunterladen (Seite 169)

User Guide NetXtreme II

September 2013

Broadcom Corporation

Document INGSRVT78-CDUM100-R Configuring the Driver Page 169

CONFIGURING THE DRIVER

The bnxe driver can be configured via the bnxe.conf file installed under /kernel/drv. When this config file is modified, the

system must be either rebooted or the driver unloaded and reconfigured using the update_drv admin command.

All configuration can be specified per-instance. The format used is as follows and each line must end with a semicolon:

bnxe<#>_<config_item>=X;

So for adv_autoneg_cap, you would use the following:

bnxe0_adv_autoneg_cap=1;

bnxe1_adv_autoneg_cap=0;

bnxe2_adv_autoneg_cap=1;

bnxe3_adv_autoneg_cap=1;

If a configuration item is not specified for a specific instance, then the default value will be used. The default value used by

all instances can be overridden using:

default_<config_item>=X;

For boolean values, 1 = TRUE and 0 = FALSE.

MEMORY USAGE

The number of RX/TX buffer descriptors specified in the configuration file can have a detrimental affect on memory usage.

If the counts are too high, DMA allocations can fail, thereby affecting other drivers loaded on the system. If DMA allocations

fail during system initialization and/or boot, then there is a chance the system will not boot. This behavior is an

implementation constraint of the Solaris OS. Additionally, it has been seen that the amount of DMA allocation space available

on a system running in 32-bit mode is less than when running as 64-bit.

For a single RX descriptor, the following is allocated:

• 1 DMA handle

• 1 DMA memory buffer that is MTU in size

• 1K memory overhead

For a single TX descriptor, the following is allocated:

• 9 DMA handles for sending chained mblks

• 1 DMA memory buffer that is MTU in size

• 1K memory overhead

NOTE: The number of DMA handles available in the system scales with the amount of RAM. With more RAM, the

descriptor counts can be safely increased.

The default number of RX/TX buffer descriptors is 2048 for each. When using a Broadcom BCM57711 network adapter in

multifunction mode, the number of configured descriptors is divided by four, ending up at 512. This is to keep the number of

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Dell Broadcom NetXtreme Family of Adapters Betriebsanweisung Seite 169