HEADS-UP: IFLIB implementations of sys/dev/e1000 em, lem, igb pending

Sean Bruno sbruno at freebsd.org
Fri Jan 6 03:18:03 UTC 2017

tl;dr --> igbX devices will become emX devices

We're about to commit an update to sys/dev/e1000 that will implement and
activate IFLIB for em(4), lem(4) & igb(4) and would appreciate all folks
who can test and poke at the drivers to do so this week.  This will have
some really great changes for performance and standardization that have
been bouncing around inside of various FreeBSD shops that have been
collaborating with Matt Macy over the last year.

This will implement multiple queues for certain em(4) devices that are
capable of such things and add some new sysctl's for you to poke at in
your monitoring tools.

Due to limitations of device registration, igbX devices will become emX
devices.  So, you'll need to make a minor update to your rc.conf and
scripts that manipulate the network devices.

UPDATING will be bumped to reflect these changes.

MFC to stable/11 will have a legacy implementation that doesn't use
IFLIB for compatibility reasons.

A documentation and man page update will follow in the next few days
explaining how to work with the changed driver.


bcc net@ current@ re@

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