how to diagnose lengthy ping times through a complex network stack

Edward Vielmetti edward.vielmetti at
Sat Nov 10 05:56:47 CET 2018

I have a network with several machines in it all running Wireguard.

The latest device I've added to this assemblage is a virtual machine
provisioned under OpenStack. It has 4 ThunderX cores (2 Ghz armv8)
subdivided off of 96-core machine. What I notice is slow network
performance through the Wireguard interface - 200 ms round trip VPN ping
times to a machine in the same data center, compared to 1 ms when
I don't go through the VPN, and only 45 ms when I use a different
machine in the same data center to an even slower Raspberry Pi 2 in my

I don't claim to be an OpenStack expert, and I know there is some
considerable complexity hiding in its network stack that might not
be visible within the VM that I'm running.

I guess the question is, what's the best way to start to make sense of
network performance within Wireguard (and if anyone knows the answer,
also within OpenStack?!).



Edward Vielmetti +1 734 330 2465
edward.vielmetti at
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