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FS#3115 - Performance/ping/network latency regression in OpenWrt 19.07.3 vs 19.07.1 #7869

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openwrt-bot opened this issue May 22, 2020 · 3 comments
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flyspray kernel pull request/issue with Linux kernel related changes release/19.07 pull request/issue targeted (also) for OpenWrt 19.07 release

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@openwrt-bot
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birdie:

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

@openwrt-bot
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birdie:

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).

@openwrt-bot
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vochong:

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)?

@openwrt-bot
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birdie:

After a few reboots it got back to normal.

Please close as INVALID.

@aparcar aparcar added release/19.07 pull request/issue targeted (also) for OpenWrt 19.07 release kernel pull request/issue with Linux kernel related changes labels Feb 22, 2022
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flyspray kernel pull request/issue with Linux kernel related changes release/19.07 pull request/issue targeted (also) for OpenWrt 19.07 release
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