New N2+ Ethernet speeds extremely slow...?

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leetauri
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New N2+ Ethernet speeds extremely slow...?

Post by leetauri »

Hi everyone!

I'm new to the forum, and new to Odroid in general. I got an N2+ to learn more sys-admin in general, and eventually to build my mini-cluster for scientific purposes. So forgive me if my questions are extremely noob!

I flashed the latest version of Ubuntu Mate onto SD card, and it's all working fine. I've connected via ethernet cable to my router. Wifi is working at normal speeds via my laptop, however the ethernet connection to my N2+ is so slow that downloading package updates would take hours, and speedtests usually time out completely, but I did get something like 40 kbps at one stage.

Any idea what might be going on?

Thank you!

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Re: New N2+ Ethernet speeds extremely slow...?

Post by mad_ady »

Can you show us the output of sudo ethtool eth0. Also, can you ping your gateway and see if there is packet loss? Can you run iperf3 between the n2 and a lan computer?
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leetauri (Sun Aug 02, 2020 5:23 am)

leetauri
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Re: New N2+ Ethernet speeds extremely slow...?

Post by leetauri »

Thanks for getting back to me! I had originally responded with some photos of my monitor that I attached via my laptop....

But, it turns out that I can actually ssh into the N2 - although terminal keeps freezing, and the connection often times out...

Anyway:

Code: Select all

Settings for eth0:
	Supported ports: [ TP MII ]
	Supported link modes:   10baseT/Half 10baseT/Full
	                        100baseT/Half 100baseT/Full
	                        1000baseT/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
	                        1000baseT/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
	                                     1000baseT/Full
	Link partner advertised pause frame use: Symmetric
	Link partner advertised auto-negotiation: Yes
	Link partner advertised FEC modes: Not reported
	Speed: 1000Mb/s
	Duplex: Full
	Port: MII
	PHYAD: 0
	Transceiver: external
	Auto-negotiation: on
	Supports Wake-on: ug
	Wake-on: d
	Current message level: 0x0000003f (63)
			       drv probe link timer ifdown ifup
	Link detected: yes
From pinging gateway:

Code: Select all

76 packets transmitted, 25 received, 67% packet loss, time 76454ms
Unfortunately I was unable to do iperf, as, although I can get the server side set up easily on my laptop, the N2's connection is too slow and unstable to download iperf!

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Re: New N2+ Ethernet speeds extremely slow...?

Post by leetauri »

mad_ady wrote:
Sun Aug 02, 2020 3:33 am
Can you show us the output of sudo ethtool eth0. Also, can you ping your gateway and see if there is packet loss? Can you run iperf3 between the n2 and a lan computer?
Further to the above - interesting development. If I change to 100M, it seems to work fine...., but with 1G, either not at all, or with very high packet loss...

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Re: New N2+ Ethernet speeds extremely slow...?

Post by rooted »

That sounds like the cable, have you tried a new CAT5e or higher LAN cable?
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leetauri (Sun Aug 02, 2020 7:00 am)

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Re: New N2+ Ethernet speeds extremely slow...?

Post by leetauri »

rooted wrote:
Sun Aug 02, 2020 6:41 am
That sounds like the cable, have you tried a new CAT5e or higher LAN cable?
I was thinking it might be something like that, but they're new CAT8 cables.. :\

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Re: New N2+ Ethernet speeds extremely slow...?

Post by tobetter »

Can you let me know the mac address of your ODROID-N2?
Also, can you try to test ping or iperf3 in the Petitboot after updating? For the latest update, please refer to the link.
viewtopic.php?p=300097#p300097

EDIT: this thread has been moved from C0/C1

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Re: New N2+ Ethernet speeds extremely slow...?

Post by mad_ady »

One more thing to check - see if your N2's ip is unique in the LAN. If it is duplicated with some other device you start experiencing delays and packet loss as described.

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Re: New N2+ Ethernet speeds extremely slow...?

Post by rooted »

leetauri wrote:
rooted wrote:
Sun Aug 02, 2020 6:41 am
That sounds like the cable, have you tried a new CAT5e or higher LAN cable?
I was thinking it might be something like that, but they're new CAT8 cables.. :\
I would still try a different cable to definitively rule it out.

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