Dell PowerEdge SC1435 User Manual download pdf (Page 8)

6 Broadcom NetXtreme and NetXtreme II TOE

Linux High-Stress Environments Running Multiple NetXtreme II

Adapters

In high-stress Linux environments running multiple NetXtreme II NICs, the Broadcom 5708 network

connection may run out of receive buffers. The default receive descriptor ring size for a 5708 connection

is 100. If network traffic shows excessive dropped packets and connection timeouts, increase the size

of the receive description ring using the following command string.

ethtool -G ethn rx size

where n is the number of the Ethernet channel and size is the new size of the receive description ring.

The following example changes the receive ring size for eth0 to 400:

ethtool -G eth0 rx 400

When prompted to verify the change, enter the following command:

ethtool -g eth0

To make the updated receive descriptor ring setting permanent, do the following:

• For Red Hat

Linux

, add the

ethtool

entry to

/etc/rc.d/rc.local

• For SUSE

Linux, perform the following procedure:

Add the following to the interface configuration file in

/etc/sysconfig/network

POST_UP_SCRIPT=set_ring_size

Create a

set_ring_size

script file with the following commands and place it in

/etc/sysconfig/network/scripts

#!/bin/bash

ethtool –G ethn rx size

where

is the number of the Ethernet channel and

size

is the new size of the receive description

ring.

Make the script executable by running the following command:

chmod +x set_ring_size

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Dell PowerEdge SC1435 User Manual Page 8