[SOLVED] ethtool shows 100Mb/s but only getting 10Mb/s

baboulinet · 2022-01-01 16:08:27

Hi,

I'm using a usb-ethernet adapter (ASUS AX88772B USB 2.0 Ethernet) which supports 100Mb/s speed, but I'm only getting around 10Mb/s when transferring files (over ssh or ftp) from the laptop to a local server (which also can handle 100Mb/s), even with a direct link, i.e without any switch in between.

ethtool gives the following

Settings for enp0s20u2:
	Supported ports: [ TP	 MII ]
	Supported link modes:   10baseT/Half 10baseT/Full
	                        100baseT/Half 100baseT/Full
	Supported pause frame use: No
	Supports auto-negotiation: Yes
	Supported FEC modes: Not reported
	Advertised link modes:  10baseT/Half 10baseT/Full
	                        100baseT/Half 100baseT/Full
	Advertised pause frame use: No
	Advertised auto-negotiation: Yes
	Advertised FEC modes: Not reported
	Link partner advertised link modes:  10baseT/Half 10baseT/Full
	                                     100baseT/Half 100baseT/Full
	Link partner advertised pause frame use: No
	Link partner advertised auto-negotiation: Yes
	Link partner advertised FEC modes: Not reported
	Speed: 100Mb/s
	Duplex: Full
	Auto-negotiation: on
	Port: MII
	PHYAD: 16
	Transceiver: internal
	Supports Wake-on: pg
	Wake-on: p
        Current message level: 0x00000007 (7)
                               drv probe link
	Link detected: yes

and here are the interface characteristics

$ sudo lshw -class network
  *-network
       description: Ethernet interface
       physical id: 1
       bus info: usb@3:2
       logical name: enp0s20u2
       serial: 9c:eb:e8:1d:62:f4
       size: 100Mbit/s
       capacity: 100Mbit/s
       capabilities: ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=asix driverversion=22-Dec-2011 duplex=full firmware=ASIX AX88772B USB 2.0 Ethernet ip=192.168.1.101 link=yes multicast=yes port=MII speed=100Mbit/s

The ethernet cable is of CAT 7 and it s brand new.

Does anyone have any clues of why the transfer is limited to 10Mb/s ?

Last edited by baboulinet (2022-01-01 16:20:20)

seth · 2022-01-01 16:12:53

which supports 100Mb/s speed, but I'm only getting around 10Mb/s when transferring files

Are you confusing Mbits and MBytes? The 100Mbit connection will get you 12.5MByte (what eg. wget will typically show) and minus some overhead you're at an effective rate of ~10MByte/s

baboulinet · 2022-01-01 16:17:42

seth wrote:

which supports 100Mb/s speed, but I'm only getting around 10Mb/s when transferring files
Are you confusing Mbits and MBytes? The 100Mbit connection will get you 12.5MByte (what eg. wget will typically show) and minus some overhead you're at an effective rate of ~10MByte/s

My bad, yes it makes sense, thanks

Arch Linux

#1 2022-01-01 16:08:27

[SOLVED] ethtool shows 100Mb/s but only getting 10Mb/s

#2 2022-01-01 16:12:53

Re: [SOLVED] ethtool shows 100Mb/s but only getting 10Mb/s

#3 2022-01-01 16:17:42

Re: [SOLVED] ethtool shows 100Mb/s but only getting 10Mb/s

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