https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=282095
Bug ID: 282095
Summary: enic breaks when changing MTU on interfaces with fib
other than 0
Product: Base System
Version: 14.1-RELEASE
Hardware: amd64
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
I'm running a Cisco UCS C220M4 with an MLOM card (2 x 10Gb). I wanted to test
the enic driver for throughput, so I plugged a DAC cable between the ports,
installed a fresh version of 14.1-RELEASE and ran the following:
sysctl net.fibs=3
ifconfig enic0 inet 172.12.1.1/24 fib 1
ifconfig enic1 inet 172.12.2.1/24 fib 2
route add 172.12.2.0/24 -iface enic0 -fib 1
route add 172.12.1.0/24 -iface enic1 -fib 2
I could then ping/iper3 between the interfaces no problem (with setfib 1 ...)
As soon as I alter the MTU of either interface to 9000 bytes, I can no longer
ping, all IP breaks.
PS. The reason I wanted to bump the MTU was I could only get ~3.7Gb/s of UDP
across the interfaces:
[ 5] 0.00-10.00 sec 4.27 GBytes 3.67 Gbits/sec 0.001 ms 1142296/4280693
(27%) receiver
You can see 27% from the sender's side was dropped. Packets were 1460 bytes.
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