Dell PowerEdge SC1435 Installation Von Broadcom Seite 8

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:
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• For Red Hat Linux
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• For SUSE Linux, perform the following procedure:
Add the following to the interface configuration file in /etc/sysconfig/network.
a
POST_UP_SCRIPT=set_ring_size
Create a set_ring_size script file with the following commands and place it in
b
/etc/sysconfig/network/scripts.
#!/bin/bash
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.
Make the script executable by running the following command:
c
chmod +x set_ring_size
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Broadcom NetXtreme and NetXtreme II TOE
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, add the ethtool entry to /etc/rc.d/rc.local.