Recover From a Port Hang (Oracle Solaris)

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Take one of these actions.
- If the interface encounters a soft hang, replumb the device.
  
  Use the ipadm(1M) command.
- If the interface encounters a hard hang, reboot the server.
- If the interface encounters another hard hang, try to capture the trace information by using the dtrace(1M) command, as in this example:
```
# detrace -F -m 'i40e{trace(timestamp)}'
>/tmp/dtrace.out
```
- If the server is panicked, retrieve the crash dump in /var/crash.
- If the interface encountered a hard hang or a panic, file a CR at My Oracle Support.
  
  Attach the last page of the dtrace(1M) output or the crash dump file to the CR.

Use the following parameters for performance tuning in i40e.conf:

Parameters	Description
rx_itr	Interval of receive interrupts 0 to 4080, 25 (50 usec) by default .
tx_itr	Interval of transmit interrupts 0 to 4080, 25 (50 usec) by default.
rx_limit_per_intr	Maximum number of packet to receive per interrupt16 ~ 4096, 1024 by default.
rx_copy_threshold	Packet size to determine bcopy or not during receive0 ~ 9216, 128 by default.
tx_copy_threshold	Packet size to determine bcopy or not during transmit0 ~ 9216, 128 by default