NetworkManager is working just fine here, except, I still have it at the top of the blame list:
$ systemd-analyze blame
16.231s NetworkManager.service
15.604s ModemManager.service
15.327s dirmngr.service
11.263s cron.service
4.719s preload.service
4.693s acpi-support.service
@ayla, Sorry, it took me a while to get back and run "$ journalctl -b|grep NetworkManager". It seems like it's activating and deactivating eth0 a few times and then hangs on IPv6 for a bit. I'll probably look into why it sets itself up and then deactivates because it's "managed", and try to Google the warns, or why it takes 10 seconds to write DNS information to /sbin/resolvconf. The output is below:
$ journalctl -b|grep NetworkManager
Apr 08 00:42:39 siduction64kdefx NetworkManager[1233]: <info> NetworkManager (version 0.9.8.8) is starting...
Apr 08 00:42:39 siduction64kdefx NetworkManager[1233]: <info> Read config file /etc/NetworkManager/NetworkManager.conf
Apr 08 00:42:39 siduction64kdefx NetworkManager[1233]: <info> WEXT support is enabled
Apr 08 00:42:40 siduction64kdefx NetworkManager[1233]: SCPlugin-Ifupdown: init!
Apr 08 00:42:40 siduction64kdefx NetworkManager[1233]: SCPlugin-Ifupdown: update_system_hostname
Apr 08 00:42:40 siduction64kdefx NetworkManager[1233]: SCPluginIfupdown: management mode: unmanaged
Apr 08 00:42:40 siduction64kdefx NetworkManager[1233]: SCPlugin-Ifupdown: devices added (path: /sys/devices/pci0000:00/0000:00:15.1/0000:08:00.0/net/eth0, iface: eth0)
Apr 08 00:42:40 siduction64kdefx NetworkManager[1233]: SCPlugin-Ifupdown: device added (path: /sys/devices/pci0000:00/0000:00:15.1/0000:08:00.0/net/eth0, iface: eth0): no ifupdown configuration found.
Apr 08 00:42:40 siduction64kdefx NetworkManager[1233]: SCPlugin-Ifupdown: devices added (path: /sys/devices/virtual/net/lo, iface: lo)
Apr 08 00:42:40 siduction64kdefx NetworkManager[1233]: SCPlugin-Ifupdown: device added (path: /sys/devices/virtual/net/lo, iface: lo): no ifupdown configuration found.
Apr 08 00:42:40 siduction64kdefx NetworkManager[1233]: SCPlugin-Ifupdown: end _init.
Apr 08 00:42:40 siduction64kdefx NetworkManager[1233]: <info> Loaded plugin ifupdown: (C) 2008 Canonical Ltd. To report bugs please use the NetworkManager mailing list.
Apr 08 00:42:40 siduction64kdefx NetworkManager[1233]: <info> Loaded plugin keyfile: (c) 2007 - 2010 Red Hat, Inc. To report bugs please use the NetworkManager mailing list.
Apr 08 00:42:40 siduction64kdefx NetworkManager[1233]: Ifupdown: get unmanaged devices count: 0
Apr 08 00:42:40 siduction64kdefx NetworkManager[1233]: SCPlugin-Ifupdown: (25090832) ... get_connections.
Apr 08 00:42:40 siduction64kdefx NetworkManager[1233]: SCPlugin-Ifupdown: (25090832) ... get_connections (managed=false): return empty list.
Apr 08 00:42:40 siduction64kdefx NetworkManager[1233]: Ifupdown: get unmanaged devices count: 0
Apr 08 00:42:40 siduction64kdefx NetworkManager[1233]: <info> monitoring kernel firmware directory '/lib/firmware'.
Apr 08 00:42:40 siduction64kdefx NetworkManager[1233]: <info> monitoring ifupdown state file '/run/network/ifstate'.
Apr 08 00:42:41 siduction64kdefx NetworkManager[1233]: <info> WiFi hardware radio set enabled
Apr 08 00:42:41 siduction64kdefx NetworkManager[1233]: <info> WiFi enabled by radio killswitch; enabled by state file
Apr 08 00:42:41 siduction64kdefx NetworkManager[1233]: <info> WWAN enabled by radio killswitch; enabled by state file
Apr 08 00:42:41 siduction64kdefx NetworkManager[1233]: <info> WiMAX enabled by radio killswitch; enabled by state file
Apr 08 00:42:41 siduction64kdefx NetworkManager[1233]: <info> Networking is enabled by state file
Apr 08 00:42:41 siduction64kdefx NetworkManager[1233]: <warn> failed to allocate link cache: (-26) Protocol mismatch
Apr 08 00:42:41 siduction64kdefx NetworkManager[1233]: <info> (eth0): carrier is OFF
Apr 08 00:42:41 siduction64kdefx NetworkManager[1233]: <info> (eth0): new Ethernet device (driver: 'r8169' ifindex: 2)
Apr 08 00:42:41 siduction64kdefx NetworkManager[1233]: <info> (eth0): exported as /org/freedesktop/NetworkManager/Devices/0
Apr 08 00:42:41 siduction64kdefx NetworkManager[1233]: <info> (eth0): device state change: unmanaged -> unavailable (reason 'managed') [10 20 2]
Apr 08 00:42:41 siduction64kdefx NetworkManager[1233]: <info> (eth0): bringing up device.
Apr 08 00:42:41 siduction64kdefx NetworkManager[1233]: <info> (eth0): preparing device.
Apr 08 00:42:41 siduction64kdefx NetworkManager[1233]: <info> (eth0): deactivating device (reason 'managed') [2]
Apr 08 00:42:41 siduction64kdefx NetworkManager[1233]: <info> Added default wired connection 'Wired connection 1' for /sys/devices/pci0000:00/0000:00:15.1/0000:08:00.0/net/eth0
Apr 08 00:42:41 siduction64kdefx NetworkManager[1233]: <warn> /sys/devices/virtual/net/lo: couldn't determine device driver; ignoring...
Apr 08 00:42:41 siduction64kdefx NetworkManager[1233]: <warn> /sys/devices/virtual/net/lo: couldn't determine device driver; ignoring...
Apr 08 00:42:41 siduction64kdefx NetworkManager[1233]: <info> ModemManager available in the bus
Apr 08 00:42:43 siduction64kdefx NetworkManager[1233]: <info> (eth0): carrier now ON (device state 20)
Apr 08 00:42:43 siduction64kdefx NetworkManager[1233]: <info> (eth0): device state change: unavailable -> disconnected (reason 'carrier-changed') [20 30 40]
Apr 08 00:42:43 siduction64kdefx NetworkManager[1233]: <info> Auto-activating connection 'Wired connection 1'.
Apr 08 00:42:43 siduction64kdefx NetworkManager[1233]: <info> Activation (eth0) starting connection 'Wired connection 1'
Apr 08 00:42:43 siduction64kdefx NetworkManager[1233]: <info> (eth0): device state change: disconnected -> prepare (reason 'none') [30 40 0]
Apr 08 00:42:43 siduction64kdefx NetworkManager[1233]: <info> NetworkManager state is now CONNECTING
Apr 08 00:42:43 siduction64kdefx NetworkManager[1233]: <info> Activation (eth0) Stage 1 of 5 (Device Prepare) scheduled...
Apr 08 00:42:43 siduction64kdefx NetworkManager[1233]: <info> Activation (eth0) Stage 1 of 5 (Device Prepare) started...
Apr 08 00:42:43 siduction64kdefx NetworkManager[1233]: <info> Activation (eth0) Stage 2 of 5 (Device Configure) scheduled...
Apr 08 00:42:43 siduction64kdefx NetworkManager[1233]: <info> Activation (eth0) Stage 1 of 5 (Device Prepare) complete.
Apr 08 00:42:43 siduction64kdefx NetworkManager[1233]: <info> Activation (eth0) Stage 2 of 5 (Device Configure) starting...
Apr 08 00:42:43 siduction64kdefx NetworkManager[1233]: <info> (eth0): device state change: prepare -> config (reason 'none') [40 50 0]
Apr 08 00:42:43 siduction64kdefx NetworkManager[1233]: <info> Activation (eth0) Stage 2 of 5 (Device Configure) successful.
Apr 08 00:42:43 siduction64kdefx NetworkManager[1233]: <info> Activation (eth0) Stage 3 of 5 (IP Configure Start) scheduled.
Apr 08 00:42:43 siduction64kdefx NetworkManager[1233]: <info> Activation (eth0) Stage 2 of 5 (Device Configure) complete.
Apr 08 00:42:43 siduction64kdefx NetworkManager[1233]: <info> Activation (eth0) Stage 3 of 5 (IP Configure Start) started...
Apr 08 00:42:43 siduction64kdefx NetworkManager[1233]: <info> (eth0): device state change: config -> ip-config (reason 'none') [50 70 0]
Apr 08 00:42:43 siduction64kdefx NetworkManager[1233]: <info> Activation (eth0) Beginning DHCPv4 transaction (timeout in 45 seconds)
Apr 08 00:42:43 siduction64kdefx NetworkManager[1233]: <info> dhclient started with pid 1833
Apr 08 00:42:43 siduction64kdefx NetworkManager[1233]: <info> Activation (eth0) Beginning IP6 addrconf.
Apr 08 00:42:43 siduction64kdefx NetworkManager[1233]: <info> Activation (eth0) Stage 3 of 5 (IP Configure Start) complete.
Apr 08 00:42:43 siduction64kdefx NetworkManager[1233]: <info> (eth0): DHCPv4 state changed nbi -> preinit
Apr 08 00:42:44 siduction64kdefx NetworkManager[1233]: <info> (eth0): DHCPv4 state changed preinit -> bound
Apr 08 00:42:44 siduction64kdefx NetworkManager[1233]: <info> address 192.168.1.107
Apr 08 00:42:44 siduction64kdefx NetworkManager[1233]: <info> prefix 24 (255.255.255.0)
Apr 08 00:42:44 siduction64kdefx NetworkManager[1233]: <info> gateway 192.168.1.1
Apr 08 00:42:44 siduction64kdefx NetworkManager[1233]: <info> nameserver '167.206.13.180'
Apr 08 00:42:44 siduction64kdefx NetworkManager[1233]: <info> nameserver '167.206.13.181'
Apr 08 00:42:44 siduction64kdefx NetworkManager[1233]: <info> nameserver '192.168.1.1'
Apr 08 00:42:44 siduction64kdefx NetworkManager[1233]: <info> Activation (eth0) Stage 5 of 5 (IPv4 Configure Commit) scheduled...
Apr 08 00:42:44 siduction64kdefx NetworkManager[1233]: <info> Activation (eth0) Stage 5 of 5 (IPv4 Commit) started...
Apr 08 00:42:45 siduction64kdefx NetworkManager[1233]: <info> (eth0): device state change: ip-config -> secondaries (reason 'none') [70 90 0]
Apr 08 00:42:45 siduction64kdefx NetworkManager[1233]: <info> Activation (eth0) Stage 5 of 5 (IPv4 Commit) complete.
Apr 08 00:42:45 siduction64kdefx NetworkManager[1233]: <info> (eth0): device state change: secondaries -> activated (reason 'none') [90 100 0]
Apr 08 00:42:46 siduction64kdefx NetworkManager[1233]: <info> NetworkManager state is now CONNECTED_GLOBAL
Apr 08 00:42:46 siduction64kdefx NetworkManager[1233]: <info> Policy set 'Wired connection 1' (eth0) as default for IPv4 routing and DNS.
Apr 08 00:42:46 siduction64kdefx NetworkManager[1233]: <info> Writing DNS information to /sbin/resolvconf
Apr 08 00:42:56 siduction64kdefx NetworkManager[1233]: <info> Activation (eth0) successful, device activated.
Apr 08 00:43:03 siduction64kdefx NetworkManager[1233]: <info> (eth0): IP6 addrconf timed out or failed.
Apr 08 00:43:03 siduction64kdefx NetworkManager[1233]: <info> Activation (eth0) Stage 4 of 5 (IPv6 Configure Timeout) scheduled...
Apr 08 00:43:03 siduction64kdefx NetworkManager[1233]: <info> Activation (eth0) Stage 4 of 5 (IPv6 Configure Timeout) started...
Apr 08 00:43:03 siduction64kdefx NetworkManager[1233]: <info> Activation (eth0) Stage 4 of 5 (IPv6 Configure Timeout) complete.