[FS#567] mvebu: WRT1200AC wireless has latency fluctuations and, sometimes, packet loss

[LEDE Bugs]

A new Flyspray task has been opened.  Details are below. 

User who did this - xavifr (xavifr) 

Attached to Project - LEDE Project
Summary - mvebu: WRT1200AC wireless has latency fluctuations and, sometimes, packet loss
Task Type - Bug Report
Category - Kernel
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Low
Priority - Very Low
Reported Version - All
Due in Version - Undecided
Due Date - Undecided
Details - Supply the following if possible:

 - Device problem occurs on
Linksys WRT1200AC v1

 - Software versions of LEDE release, packages, etc.
   * LEDE 17.01 final release (from downloads.lede-project.org)
   * LEDE 17.01 custom compiled/build
   * LEDE trunk (from downloads.lede-project.org)


 - Steps to reproduce
   * Download image from https://downloads.lede-project.org/snapshots/targets/mvebu/generic/
   * Start router with default config (eth1.2 with dhcp client, br-lan (eth0.1) with 192.168.1.1/24 and dhcp server active)
   * Enable wireless 
     > uci delete wireless. at wifi-device[0].disabled
     > uci set wireless. at wifi-iface[0].ssid=LEDE_5
     > uci delete wireless. at wifi-device[1].disabled
     > uci set wireless. at wifi-iface[1].ssid=LEDE_2
     > uci commit wireless
     > wifi up
   * Install FPing
     > opkg update
     > opkg install fping

   * Connect device using wireless LEDE_2
   * Get device ip from /tmp/dhcp.leases
   * Ping it
     > root at LEDE:/# fping -p25 -b1472 -c100 -q 192.168.1.123
     > 192.168.1.123 : xmt/rcv/%loss = 100/100/0%, min/avg/max = 6.55/62.3/512

   * Connect device using wireless LEDE_5
   * Get device ip from /tmp/dhcp.leases
   * Ping it
     > root at LEDE:/# fping -p25 -b1472 -c100 -q 192.168.1.123
     > 192.168.1.123 : xmt/rcv/%loss = 100/100/0%, min/avg/max = 2.64/39.5/157




More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=567