Public bug reported:
[Problem description]
Somehow wifi network latency is too high. (1000~3000 ms)
DUT:
- Product: Lenovo X1C6
- BIOS Information:
Vendor: LENOVO
Version: N23ET74W (1.49 )
Release Date: 06/03/2020
- Wifi information:
Intel Wireless 8265 / 8275
driverversion=5.3.0-62-generic firmware=36.9f0a2d68.0
- OS: Ubuntu 18.04.4 LTS/Linux 5.3.0-62-generic/X86-64
[Test steps]
1. Boot up Ubuntu 18.04.4 LTS.
2. Open terminal.
3. To execute ping command, and target is in the local network. (For
example: local gateway)
4. After few mins, I noticed that network latency will get worse.
Sample output:
64 bytes from 192.168.1.1: icmp_seq=714 ttl=64 time=2.31 ms
64 bytes from 192.168.1.1: icmp_seq=715 ttl=64 time=1.61 ms
64 bytes from 192.168.1.1: icmp_seq=716 ttl=64 time=8.93 ms
64 bytes from 192.168.1.1: icmp_seq=717 ttl=64 time=59.0 ms
64 bytes from 192.168.1.1: icmp_seq=718 ttl=64 time=101 ms
64 bytes from 192.168.1.1: icmp_seq=719 ttl=64 time=155 ms
64 bytes from 192.168.1.1: icmp_seq=720 ttl=64 time=212 ms
64 bytes from 192.168.1.1: icmp_seq=721 ttl=64 time=347 ms
64 bytes from 192.168.1.1: icmp_seq=722 ttl=64 time=485 ms
64 bytes from 192.168.1.1: icmp_seq=723 ttl=64 time=663 ms
64 bytes from 192.168.1.1: icmp_seq=724 ttl=64 time=914 ms
64 bytes from 192.168.1.1: icmp_seq=725 ttl=64 time=1149 ms
64 bytes from 192.168.1.1: icmp_seq=726 ttl=64 time=1490 ms
64 bytes from 192.168.1.1: icmp_seq=727 ttl=64 time=1828 ms
64 bytes from 192.168.1.1: icmp_seq=728 ttl=64 time=2154 ms
64 bytes from 192.168.1.1: icmp_seq=729 ttl=64 time=2609 ms
64 bytes from 192.168.1.1: icmp_seq=730 ttl=64 time=2851 ms
64 bytes from 192.168.1.1: icmp_seq=731 ttl=64 time=2825 ms
64 bytes from 192.168.1.1: icmp_seq=732 ttl=64 time=2184 ms
64 bytes from 192.168.1.1: icmp_seq=733 ttl=64 time=2582 ms
64 bytes from 192.168.1.1: icmp_seq=734 ttl=64 time=1898 ms
64 bytes from 192.168.1.1: icmp_seq=735 ttl=64 time=1377 ms
5. Same machine when I switched to W10 then I didn't encounter this
symptom.
[Expected result]
Wifi network latency should not over 2~3 ms at least.
[Actual result]
Wifi network latency is too high.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1887214
Title:
[18.04 LTS] Somehow wifi network latency is too high (1000~3000 ms)
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