AWS M5 ena issues

From: Pete Wright <>
Date: Fri, 6 Jul 2018 16:22:34 -0700
hi there - this is in relation to this ticket:

"ena driver causing kernel panics on AWS EC2"

reading through the thread, and Colin's blog post on the new M5 instance 
types, it looks like the issues people are running into are related to 
NVMe devices fronting EBS block stores. My question is is this a 
discreet issue from other anomalies people have seen with ena network 
devices.  For example, on some currently lightly loaded m5.large 
instances I have been seeing this in the logs pretty regularly:

ena0: device is going DOWN
ena0: device is going UP
ena0: queue 0 - cpu 0
ena0: queue 1 - cpu 1

These systems were previously running 11.1-RELEASE, which I upgraded to 
11.2-RELEASE via "freebsd-update".  These messages only started showing 
up after I had completed the upgrade.2

from reading the bug report above though it's not clear as to the state 
of the ena drivers themselves.  Are they considered unstable on 


Pete Wright
Received on Fri Jul 06 2018 - 21:22:41 UTC

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