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ServerU PFSense Troubleshooting Network Intel
Posted by Rafael Honorato on 30/Nov 14:38

Intel igb(4) and em(4) Cards

Some Intel igb cards, especially multi-port cards, can very easily exhaust mbufs and cause kernel panics, especially on amd64. The following tweak will prevent this from being an issue:

In /boot/loader.conf.local - Add the following (or create the file if it does not exist):

kern.ipc.nmbclusters="1000000"

That will increase the amount of network memory buffers, allowing the driver enough headroom for its optimal operation.

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