[ale] Strange wired ethernet performance issue

[JD]

Wired ethernet with wifi enabled is great - 900+Mbit/sec.
Wire Ethernet without wifi enabled is terrible - 12Kbit/sec.
WiFi alone is as expected - aoubt 12Mbit/sec.

$ iperf -c hadar
------------------------------------------------------------
Client connecting to hadar, TCP port 5001
TCP window size: 22.9 KByte (default)
------------------------------------------------------------
[  3] local 172.22.22.102 port 43716 connected with 172.22.22.6 port 5001
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-10.0 sec  1.07 GBytes   921 Mbits/sec

This is highly repeatable with results from 850Mb/sec to 950+Mb/sec. Routing
looks fine with and without wifi enabled.  Metrics are good.

$ route
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
default         rt1             0.0.0.0         UG    0      0        0 eth0
10.0.3.0        *               255.255.255.0   U     0      0        0 lxcbr0
172.22.22.0     *               255.255.255.0   U     1      0        0 eth0
172.22.22.0     *               255.255.255.0   U     9      0        0 wlan0
192.168.122.0   *               255.255.255.0   U     0      0        0 virbr0

Ahhhh - if I disable wifi through the GUI, it does something to the wired
connection (that I haven't discovered yet). GUIs screw things up again.
However, if I use "sudo ifconfig wlan0 down", then the performance remains high
- as expected.

Once again - GUIs suck.

BTW - the ethernet is a USB3 hub + GigE device. The C720 doesn't have any wired
network ports.  It is just that NFS isn't nearly as nice over wifi as over a
wired connection.

It is an amazing netbook device for $200 - only useable thanks to HUGE keybaord
remapping efforts, though I did hit the DEL key while typing this today. First
time in many days - for those who don't know, the C720 doesn't have a DEL key -
some genius decided to put the POWER key there. Idiots.