#20434: Sluggish wireless pings with 15.05-HEAD on a WNR2000v1
----------------------+-----------------------------------
Reporter: nabcore | Owner: developers
Type: defect | Status: new
Priority: high | Milestone: Chaos Calmer (trunk)
Component: kernel | Version: Trunk
Resolution: | Keywords: WNR2000v1 ar71xx AP81
----------------------+-----------------------------------
Comment (by nabcore):
Seeing this with 15.05 final as well. Let me try to back this up with some
data.
These are the ping statistics from 100 pings, repeated three times from
the same wireless client with the router running 15.05 and then 14.07:
{{{
~$ ping -c 100 192.168.0.1
100 pings x3 from void with 15.05
=================================
--- 192.168.0.1 ping statistics ---
100 packets transmitted, 100 received, 0% packet loss, time 99114ms
rtt min/avg/max/mdev = 0.568/3.588/16.555/3.273 ms
--- 192.168.0.1 ping statistics ---
100 packets transmitted, 100 received, 0% packet loss, time 99132ms
rtt min/avg/max/mdev = 0.647/16.355/69.835/14.664 ms
--- 192.168.0.1 ping statistics ---
100 packets transmitted, 100 received, 0% packet loss, time 99129ms
rtt min/avg/max/mdev = 0.826/9.153/120.652/16.580 ms
100 pings x3 from void with 14.07
=================================
--- 192.168.0.1 ping statistics ---
100 packets transmitted, 100 received, 0% packet loss, time 99110ms
rtt min/avg/max/mdev = 0.775/7.636/87.727/14.170 ms
--- 192.168.0.1 ping statistics ---
100 packets transmitted, 100 received, 0% packet loss, time 99112ms
rtt min/avg/max/mdev = 0.741/6.245/67.979/10.403 ms
--- 192.168.0.1 ping statistics ---
100 packets transmitted, 100 received, 0% packet loss, time 99089ms
rtt min/avg/max/mdev = 0.534/3.549/29.351/4.308 ms
}}}
I would conclude that there is really not much difference here. However,
if we run a slightly different test whereby the client is also
downloading, the results are quite different:
{{{
# Running the following download in the background
wget https://downloads.openwrt.org/chaos_calmer/15.05/ar71xx/generic
/OpenWrt-ImageBuilder-15.05-ar71xx-generic.Linux-x86_64.tar.bz2
15.05:
======
$ ping 192.168.0.1
PING 192.168.0.1 (192.168.0.1) 56(84) bytes of data.
64 bytes from 192.168.0.1: icmp_seq=1 ttl=64 time=577 ms
64 bytes from 192.168.0.1: icmp_seq=2 ttl=64 time=720 ms
64 bytes from 192.168.0.1: icmp_seq=3 ttl=64 time=924 ms
64 bytes from 192.168.0.1: icmp_seq=4 ttl=64 time=1206 ms
64 bytes from 192.168.0.1: icmp_seq=5 ttl=64 time=1495 ms
64 bytes from 192.168.0.1: icmp_seq=6 ttl=64 time=1603 ms
64 bytes from 192.168.0.1: icmp_seq=7 ttl=64 time=1813 ms
64 bytes from 192.168.0.1: icmp_seq=8 ttl=64 time=1690 ms
64 bytes from 192.168.0.1: icmp_seq=9 ttl=64 time=1551 ms
64 bytes from 192.168.0.1: icmp_seq=10 ttl=64 time=1075 ms
64 bytes from 192.168.0.1: icmp_seq=11 ttl=64 time=1318 ms
64 bytes from 192.168.0.1: icmp_seq=12 ttl=64 time=1346 ms
64 bytes from 192.168.0.1: icmp_seq=13 ttl=64 time=1498 ms
64 bytes from 192.168.0.1: icmp_seq=14 ttl=64 time=1199 ms
64 bytes from 192.168.0.1: icmp_seq=15 ttl=64 time=1002 ms
14.07:
======
~$ ping 192.168.0.1
PING 192.168.0.1 (192.168.0.1) 56(84) bytes of data.
64 bytes from 192.168.0.1: icmp_seq=1 ttl=64 time=2.06 ms
64 bytes from 192.168.0.1: icmp_seq=2 ttl=64 time=5.63 ms
64 bytes from 192.168.0.1: icmp_seq=3 ttl=64 time=13.1 ms
64 bytes from 192.168.0.1: icmp_seq=4 ttl=64 time=10.7 ms
64 bytes from 192.168.0.1: icmp_seq=5 ttl=64 time=34.5 ms
64 bytes from 192.168.0.1: icmp_seq=6 ttl=64 time=100 ms
64 bytes from 192.168.0.1: icmp_seq=7 ttl=64 time=187 ms
64 bytes from 192.168.0.1: icmp_seq=8 ttl=64 time=6.38 ms
64 bytes from 192.168.0.1: icmp_seq=9 ttl=64 time=141 ms
64 bytes from 192.168.0.1: icmp_seq=10 ttl=64 time=253 ms
64 bytes from 192.168.0.1: icmp_seq=11 ttl=64 time=236 ms
64 bytes from 192.168.0.1: icmp_seq=12 ttl=64 time=3.70 ms
64 bytes from 192.168.0.1: icmp_seq=13 ttl=64 time=0.892 ms
64 bytes from 192.168.0.1: icmp_seq=14 ttl=64 time=0.770 ms
64 bytes from 192.168.0.1: icmp_seq=15 ttl=64 time=2.25 ms
}}}
It would seem that 15.05 has a higher latency when downloading on the same
wireless interface.
--
Ticket URL: <https://dev.openwrt.org/ticket/20434#comment:1>
OpenWrt <http://openwrt.org>
Opensource Wireless Router Technology
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