AIX 5L Problem Determination - IBM Redbooks

Late Collision Errors
The Late Collision Errors statistic shows the number of unsuccessful
transmissions due to the late collision error.
Timeout Errors
The Timeout Errors statistic shows the number of unsuccessful transmissions
due to adapter-reported timeout errors.
Single Collision Count
The Single Collision Count statistic shows the number of outgoing packets with a
single (only one) collision encountered during transmission.
Multiple Collision Count
The Multiple Collision Count statistic shows the number of outgoing packets with
multiple (2–15) collisions encountered during transmission.
Receive Collision Errors
The Receive Collision Errors statistic shows the number of incoming packets
with collision errors during reception.
No mbuf Errors
The No mbuf Errors statistic shows the number of times that mbufs were not
available to the device driver. This usually occurs during receive operations
when the driver must obtain memory buffers to process inbound packets. If the
mbuf pool for the requested size is empty, the packet will be discarded. Use the
netstat -m command to confirm this, and increase the thewall parameter.
The No mbuf Errors value is interface specific and not identical to the requests
for mbufs denied from the netstat -m output. Compare the values of the
example for the commands netstat -m and netstat -v (the Ethernet and
token-ring part).
Tuning guidelines based on netstat -v
To check for an overloaded Ethernet network, calculate (from the netstat -v
command):
(Max Collision Errors + Timeout Errors) / Transmit Packets
If the result is greater than five percent, reorganize the network to balance the
load.
Another indication for a high network load is found in the output of the command
netstat -v.
272 IBM ^ Certification Study Guide - AIX 5L Problem Determination Tools and Techniques