Stumped on Internet/Network speed issues

grininmonkey · 2019-02-20 14:53:44

System in question has 3 drives with 3 separate installs/setups of Archlinux....

1 ( my primary everyday boot too ) has i3 and KDE setup.... I have noticed in the past couple of days that my internet speed ( looking at results from speedtest-cli ) has been limited to 25 Mbit/s so at first I thought I had a router or service issue, however all other systems on my network report the expected 200+ Mbit/s range.

So when I boot into any of the other two instances of Arch on my System in question.... speedtest results are good ... they are in the expected 200 Mbit/s range...

But for some reason when I boot into my everyday drive/instance .... it will not report past 25 Mbit/s ..... My local DHCP server is assigning a reserved address based on the NIC and I get the same IP, DHCP settings etc... between any drive or instance that I boot to on this system.

All three drives in terms of network setup are using NetworkManager and.... all three separate instances have the same updated version etc...

I am stumped currently trying to figure out what in the world could be limiting or restricting my internet speed when booting to this instance.

Between all instances .... nmcli active/profile etc... output is identical ... so configuration is the same... IP is the same, the routes are the same... Yet this one instance will not get past 25 Mbit/s on speedtest

Local network performance between this system and another node appears to be normal... but I don't know off hand if there is a point to point test like speedtest for a local system.. file transfer and rsync are normal and expected.

Thanks in advance for any suggestions in areas to look?

ewaller · 2019-02-20 14:57:20

Wired or Wireless?
What are the chipsets used in the NIC?
What is the output of ip link ??

grininmonkey · 2019-02-20 15:00:32

Wired

03:00.0 Ethernet controller: Qualcomm Atheros Killer E2400 Gigabit Ethernet Controller (rev 10)
	Subsystem: Micro-Star International Co., Ltd. [MSI] Killer E2400 Gigabit Ethernet Controller
	Flags: bus master, fast devsel, latency 0, IRQ 18
	Memory at de100000 (64-bit, non-prefetchable) [size=256K]
	I/O ports at d000 [size=128]
	Capabilities: <access denied>
	Kernel driver in use: alx
	Kernel modules: alx

ip link
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: enp3s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP mode DEFAULT group default qlen 1000
    link/ether d8:cb:8a:9f:46:7a brd ff:ff:ff:ff:ff:ff

ewaller · 2019-02-20 15:24:28

Try using ethtool to list the settings of enp3s0: ethtool enp3s0

Check the values of Speed and Auto-negotiation. In particular, ensure the later is on (one can use ethtool to set that)

Last edited by ewaller (2019-02-20 15:25:02)

grininmonkey · 2019-02-20 15:33:08

Ohh... snap... so something is triggering the interface to 100... but checking the NetworkManager configs... 803-E settings... they are the same between the instances..

/dev/sda (issue instance)

~$ ethtool enp3s0
Settings for enp3s0:
	Supported ports: [ TP ]
	Supported link modes:   10baseT/Half 10baseT/Full 
	                        100baseT/Half 100baseT/Full 
	                        1000baseT/Full 
	Supported pause frame use: Symmetric Receive-only
	Supports auto-negotiation: Yes
	Supported FEC modes: Not reported
	Advertised link modes:  Not reported
	Advertised pause frame use: No
	Advertised auto-negotiation: No
	Advertised FEC modes: Not reported
	Speed: 100Mb/s
	Duplex: Half
	Port: Twisted Pair
	PHYAD: 0
	Transceiver: internal
	Auto-negotiation: off
	MDI-X: Unknown
Cannot get wake-on-lan settings: Operation not permitted
	Current message level: 0x000060e4 (24804)
			       link ifup rx_err tx_err hw wol
	Link detected: yes

/dev/sdb & /dev/sdc ....

Settings for enp3s0:
	Supported ports: [ TP ]
	Supported link modes:   10baseT/Half 10baseT/Full 
	                        100baseT/Half 100baseT/Full 
	                        1000baseT/Full 
	Supported pause frame use: Symmetric Receive-only
	Supports auto-negotiation: Yes
	Supported FEC modes: Not reported
	Advertised link modes:  10baseT/Half 10baseT/Full 
	                        100baseT/Half 100baseT/Full 
	                        1000baseT/Full 
	Advertised pause frame use: Symmetric
	Advertised auto-negotiation: Yes
	Advertised FEC modes: Not reported
	Speed: 1000Mb/s
	Duplex: Full
	Port: Twisted Pair
	PHYAD: 0
	Transceiver: internal
	Auto-negotiation: on
	MDI-X: Unknown
	Current message level: 0x000060e4 (24804)
			       link ifup rx_err tx_err hw wol
	Link detected: yes

ewaller · 2019-02-20 15:40:36

Look again. auto negotiation is off on sda. on for the other 2

Edit: and duplex is half.

Last edited by ewaller (2019-02-20 15:41:14)

grininmonkey · 2019-02-20 15:49:30

Right... but I don't understand how.... because when I look at the GUI applet... I see this

https://imgur.com/xRAddh1

So I need to google and learn some more details on how to figure out why it's setting to 100 even though the settings say to auto negotiate... I didn't even think to look at the link speed... it's just always been correct until now.

grininmonkey · 2019-02-20 16:22:48

Well... I think something is loading on boot that is preventing the autoneg and advert link modes etc...

From NM config perspective... there is no custom or edited confs .. the /etc/NetworkManager files are identical between my other instances.. however just quickly trying stuff with ethtool on sda ... I get the following...

$ sudo ethtool --change enp3s0 autoneg on
Cannot set new settings: Invalid argument
  not setting autoneg


$sudo ethtool --change enp3s0 speed 1000 duplex full
Cannot set new settings: Invalid argument
  not setting speed
  not setting duplex

So now I believe the question is a little more specific....

What could be interfering with the autoneg and advertised link speeds to prevent proper Auto-Negotiation ?

Edit: additional info from dmesg.... something somewhere is setting it to 100 and I currently can't find what....

fresh boot into /dev/sdb

$ dmesg | grep enp3s0
[    2.237661] alx 0000:03:00.0 enp3s0: renamed from eth0
[    3.015117] IPv6: ADDRCONF(NETDEV_UP): enp3s0: link is not ready
[    3.015932] IPv6: ADDRCONF(NETDEV_UP): enp3s0: link is not ready
[    4.690685] alx 0000:03:00.0 enp3s0: NIC Up: 1 Gbps Full
[    4.690902] IPv6: ADDRCONF(NETDEV_CHANGE): enp3s0: link becomes ready

fresh boot into /dev/sda (issue instance)

$ dmesg | grep enp3s0
[    2.298284] alx 0000:03:00.0 enp3s0: renamed from eth0
[    3.321927] IPv6: ADDRCONF(NETDEV_UP): enp3s0: link is not ready
[    3.322585] IPv6: ADDRCONF(NETDEV_UP): enp3s0: link is not ready
[    5.455434] alx 0000:03:00.0 enp3s0: NIC Up: 1 Gbps Full
[    5.455655] IPv6: ADDRCONF(NETDEV_CHANGE): enp3s0: link becomes ready
[    5.455721] alx 0000:03:00.0 enp3s0: NIC Up: 100 Mbps Half

Last edited by grininmonkey (2019-02-20 16:44:24)

grininmonkey · 2019-02-20 19:55:21

I wasn't getting anywhere in determining what was causing the NIC to reset to 100 Mbps after initially setting to 1 Gbps.

I had "Zero" files in /etc/NetworkManager/system-connections (no saved profiles via applet/GUI)
I had no modifications to the default /etc/NetworkManager/NetworkManager.conf file
All other folders within /etc/NetworkManager contained no files

So I tried reinstalling NetworkManager which didn't seem to work until I rebooted.... I rebooted twice and both times it seems to be correctly setting to 1 Gbps...

So I hope it sticks... and I guess this is "Solved" ... but not sure what was causing all this...

Arch Linux

#1 2019-02-20 14:53:44

Stumped on Internet/Network speed issues

#2 2019-02-20 14:57:20

Re: Stumped on Internet/Network speed issues

#3 2019-02-20 15:00:32

Re: Stumped on Internet/Network speed issues

#4 2019-02-20 15:24:28

Re: Stumped on Internet/Network speed issues

#5 2019-02-20 15:33:08

Re: Stumped on Internet/Network speed issues

#6 2019-02-20 15:40:36

Re: Stumped on Internet/Network speed issues

#7 2019-02-20 15:49:30

Re: Stumped on Internet/Network speed issues

#8 2019-02-20 16:22:48

Re: Stumped on Internet/Network speed issues

#9 2019-02-20 19:55:21

Re: Stumped on Internet/Network speed issues

Board footer