Arch Linux

unclebiglu

Member

Registered: 2022-02-27

Posts: 1

iwlmvm: high latency receiving ICMP replys on peers under same AP

My wireless card is Intel AX200 on PCIE slot. It works well when visiting resources on WAN or sending ICMP pack to other device on same LAN, but when other devices on same LAN trying to send ICMP pack to this device the latency is around 100ms to 500ms with high packet loss rate.
This situation will get better if the card is on load, e.g running iperf3 or downloading files. When running iperf3 with another LAN device the ping latency would decrease to around 20 to 30 ms. 
  Heres my iwlwifi module parameters:

$ systool -vm iwlwifi
Module = "iwlwifi"

  Attributes:
    coresize            = "462848"
    initsize            = "0"
    initstate           = "live"
    refcnt              = "1"
    srcversion          = "825124BD1580FFBEF5C98A5"
    taint               = ""
    uevent              = <store method only>

  Parameters:
    11n_disable         = "0"
    amsdu_size          = "0"
    bt_coex_active      = "Y"
    debug               = "0"
    disable_11ac        = "N"
    disable_11ax        = "N"
    enable_ini          = "Y"
    fw_restart          = "Y"
    led_mode            = "0"
    nvm_file            = "(null)"
    power_level         = "0"
    power_save          = "N"
    remove_when_gone    = "N"
    swcrypto            = "0"
    uapsd_disable       = "3"

  Sections:

And my iwlmvm parameters:

Module = "iwlmvm"

  Attributes:
    coresize            = "495616"
    initsize            = "0"
    initstate           = "live"
    refcnt              = "0"
    srcversion          = "48B11B894296F2AAC58CDCE"
    taint               = ""
    uevent              = <store method only>

  Parameters:
    init_dbg            = "N"
    power_scheme        = "2"

  Sections:

Change iwlmvm parameter power_scheme in /etc/modprobe.d/iwlwifi.conf with

options iwlmvm power_scheme=1

from 2 to 1 would fix this problem, but on another device(mint 20.3) with AX210 card the default power_scheme=2 works well.

Last edited by unclebiglu (2022-02-27 11:01:04)