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overlord73 08-12-2019 09:17 AM

network xtreme slow on fresh install
Hi folks,
I got a brand new ThinkCentre M720q-MiniPC, 16GB, M2.SSD, i5 (Lenovo) and just installed debian10 on it.
All sweet and fine so long, but the networking speed is boring.
Device is on same network hardware and same routing as other devices.

Remarkable is the ping response time, it fluctuates from ~100.x ms to 1100.x ms !

And I have no idea why!?

I checked the LAN cable and did a second fresh installation.
Any help would be welcome

pan64 08-12-2019 09:38 AM

this is "usually" caused by missing/incompatible driver. You need to check /var/log or dmesg about related messages.
I don't know the type of the network interface, but probably debian does not support it (or you need to find a driver). You may try ubuntu or another distro too (from usb).

overlord73 08-13-2019 12:18 AM

it's a strange issue,sometimes the performance (ping time) is ok and sometimes not.
the setup routine identifies the ethernet as an intel i219-v, same lspci.
trying the current IGB-driver from Intel.....

give a fedora30-liveUSB a try and it works like a charme....installing fedora and the same issue as with installed debian10?!

teckk 08-13-2019 08:04 AM

You say ping time.

Is that ping url, ping external IP, or ping another machine on LAN.

If pinging a url takes long then try another DNS.

ping -c2 and ping -c2 should let you see the difference if any.

overlord73 08-13-2019 08:34 AM

ping the gateway

pan64 08-13-2019 08:36 AM


Originally Posted by overlord73 (Post 6024666)
ping the gateway

do you ping it by name or by ip address?


Originally Posted by overlord73 (Post 6024580)
give a fedora30-liveUSB a try and it works like a charme....installing fedora and the same issue as with installed debian10?!

So check what driver was used when it worked

overlord73 08-13-2019 09:07 AM

always ping by ip

hm, I can't see any differences.

both systems running/loading the e1000e driver (kernel driver in use and kernel modules).
ok it's not the driver! :confused:

pan64 08-14-2019 01:33 AM

did you check /var/log for any symptoms?

overlord73 08-15-2019 01:20 AM

nothing eye-catching,
->any specific file?

pan64 08-15-2019 01:48 AM

kernel module related ....

overlord73 08-15-2019 04:04 AM

/var/log/messages did not exist on FC30

dmesg -> anyhow nothing interesting

kernel: [ 1214.100178] e1000e: Intel(R) PRO/1000 Network Driver - 3.2.6-k
kernel: [ 1214.100181] e1000e: Copyright(c) 1999 - 2015 Intel Corporation.
kernel: [ 1214.100269] e1000e 0000:00:19.0: Interrupt Throttling Rate (ints/sec) set to dynamic conservative mode

pan64 08-15-2019 04:17 AM

from here I can only suggest you to compare boot/kernel logs for both cases.
or you can try to download/install the correct driver: (if this is the right one)

dc.901 08-15-2019 06:55 AM

If you look at "ethtool <NIC>", what is the speed? Is it correct?

overlord73 08-15-2019 09:36 AM

yes, its correct 1000 Mbps full duplex

...running out of ideas

pan64 08-15-2019 10:00 AM

did you try to download/reinstall the driver?

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