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

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).

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.....


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

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 google.com and ping -c2 216.58.192.238 should let you see the difference if any.

ping the gateway

do you ping it by name or by ip address?


So check what driver was used when it worked

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:

did you check /var/log for any symptoms?

nothing eye-catching,
->any specific file?

/var/log/messages
dmesg
kernel module related ....

/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

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: https://downloadcenter.intel.com/dow...?product=71305 (if this is the right one)
https://unix.stackexchange.com/quest...uspro-b-laptop

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

yes, its correct 1000 Mbps full duplex

...running out of ideas

did you try to download/reinstall the driver?