[colug-432] Fwd: Anybody have a NIC that supports queuing Jumbo packets?

Jon Miller jonebird at gmail.com
Fri Jul 6 21:28:33 EDT 2012

Oops. Sent to the wrong location...
---------- Forwarded message ----------
From: "Jon Miller" <jonebird at gmail.com>
Date: Jul 6, 2012 6:37 PM
Subject: Anybody have a NIC that supports queuing Jumbo packets?
To: "Central OH Linux User Group" <colugx at colug.net>

I'm researching something at work and thus far our x86 hardware variety of
NICs hasn't uncovered a model / firmware / driver combination that
supported queuing of Jumbo packets. So, I'm curious what the rest of you
might find with your HW setups? Try this, if you don't mind:
ethtool --show-ring eth0 # or substitute for your particular interface

What I'm interested in learning is if any of you are seeing a non-zero
value for "RX Jumbo" for the pre-set maximums? If are you seeing a non-zero
value, what is your driver / firmware level? (ethtool -i eth0)

Jon Miller

# And for kicks, here is a little shell excerpt to find such a NIC too:
(copy & paste this if you'd like)
for inf in $(ip link show | sed -n 's/^[0-9]*: \([^:]*\):.*/\1/p'); do
  JUMBO_RING_SIZE=$(($(ethtool --show-ring $inf 2>&1 | sed -n -e '/Current
hardware settings/,$d' -e '/^RX Jumbo/p' | awk '{ print $NF }')+0))
  if [ -n "${JUMBO_RING_SIZE}" -a "${JUMBO_RING_SIZE}" -gt 0 ]; then
    echo "Found one for you, Jon, on interface $inf"
    ethtool -i $inf
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