OpenWrt/LEDE Project

  • Status Unconfirmed
  • Percent Complete
    0%
  • Task Type Bug Report
  • Category Kernel
  • Assigned To No-one
  • Operating System All
  • Severity Medium
  • Priority Very Low
  • Reported Version openwrt-19.07
  • Due in Version Undecided
  • Due Date Undecided
  • Private
Attached to Project: OpenWrt/LEDE Project
Opened by Artem S. Tashkinov - 22.05.2020

FS#3115 - Performance/ping/network latency regression in OpenWrt 19.07.3 vs 19.07.1

Today I’ve upgraded from OpenWrt 19.07.1 to 19.07.3 and noticed that latency for my WDR3600 router has increased more than threefold.

In OpenWrt 19.07.1 ping from my PC to the router (connected via a 1Gb wired connection, less than a meter) took approximately 0.250ms

In OpenWrt 19.07.3 ping is now 0.860ms on average.

I haven’t changed any settings after upgrading to OpenWrt 19.07.3.

This is quite a serious performance regression.

When I was carrying out the tests I had zero load and zero Internet traffic, so the router CPU was completely idle.

# uptime 
 15:22:59 up  4:36,  load average: 0.00, 0.00, 0.00
Artem S. Tashkinov commented on 22.05.2020 15:29

I'm running the ATH79 build:

openwrt-19.07.1-ath79-generic-tplink_tl-wdr3600-v1-squashfs-sysupgrade.bin
and
openwrt-19.07.3-ath79-generic-tplink_tl-wdr3600-v1-squashfs-sysupgrade.bin

I have the iptables-mod-filter kernel modules installed and a few pretty simple filters using them (all in the FORWARD chain which means they can't possibly affect the PC ↔ router connection).

vochong commented on 23.05.2020 17:56

If you downgrade it from 19.07.3 back to 19.07.1, does the ping latency drop back to the original value (aka about 0.250ms)?

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