[arm-allstar] RPi Zero 2 W wireless slow

[David McGough]

Larry,

I've got 2 RPiZ2W boards setup as "radioless" test nodes. I don't see this 
issue with either of them.  They're both currently +/- 20 feet from the 
AP, which is a Ubiquiti LocoM2.

Yes, the RPiZ2W uses a different WiFi chipset and drivers from all other 
RRi hardware.

It's not uncommon for the first ping to take a significantly longer---
perhaps as long as 1/10 second or so. This situation would occur if the
MAC address of the RPiZ2W isn't already cached on the system where the
ping originates and the originating system must send (and receive) ARP
requests to learn the MAC address.....However, the very long ping times
you listed aren't normal, of course.

Have you tried power cycling the AP?  How about moving the RPiZ2W into a 
different spot?  After the initial "lag," do the ping times reliably 
stabilize at a shorter time (like about 5mS)??  Try a ping -c 1000, for 
example.


73, David KB4FXC


On Thu, 3 Mar 2022, "Larry via ARM-allstar" wrote:

> I have just installed Hamvoip software on a Pi Zero 2 W. I have found 
that Zero 2 wifi has a lag when it is first starts communicating.

This lag apparently is causing a Congest error when trying to connect 
with other Hamvoip nodes.

I don't see this lag with any other full sized RPi3 units. Is anyone 
else seeing this lag?

The PI Zero 2 W card was set up on a RPi3 unit as I didn't have a mini 
HDMI adapter to connect a monitor.

Is there a difference in WIFI drivers that get installed on the 
different platforms?

Any advice ?


Difference in Ping times. Both wireless RPi  units sit 5 foot away from 
the wireless router and away from each other

WLAN TO A PI 3 unit
# /sbin/ping -S '192.168.10.1' -c '3' '192.168.10.218'
PING 192.168.10.218 (192.168.10.218) from 192.168.10.1: 56 data bytes
64 bytes from 192.168.10.218: icmp_seq=0 ttl=64 time=4.917 ms
64 bytes from 192.168.10.218: icmp_seq=1 ttl=64 time=4.772 ms
64 bytes from 192.168.10.218: icmp_seq=2 ttl=64 time=4.643 ms

WLAN TO PI ZERO 2 W
# /sbin/ping -S '192.168.10.1' -c '3' '192.168.10.102'
PING 192.168.10.102 (192.168.10.102) from 192.168.10.1: 56 data bytes
64 bytes from 192.168.10.102: icmp_seq=0 ttl=64 time=1684.044 ms
64 bytes from 192.168.10.102: icmp_seq=1 ttl=64 time=658.917 ms
64 bytes from 192.168.10.102: icmp_seq=2 ttl=64 time=4.585 ms

WLAN TO PI ZERO 2 W (2ND TRY)
# /sbin/ping -S '192.168.10.1' -c '3' '192.168.10.102'
PING 192.168.10.102 (192.168.10.102) from 192.168.10.1: 56 data bytes
64 bytes from 192.168.10.102: icmp_seq=0 ttl=64 time=1954.002 ms
64 bytes from 192.168.10.102: icmp_seq=1 ttl=64 time=940.463 ms
64 bytes from 192.168.10.102: icmp_seq=2 ttl=64 time=4.442 ms


Larry - N7FM

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