Re: Diagnosing virtual machine network issues

> Can you provide more context?  I'm not seeing earlier messages anywhere in my email folders.  Is this a Qemu issue?

The original message is from just over a month ago, archived here:
https://lists.freebsd.org/archives/freebsd-hackers/2024-June/003378.html
Basically, we have FreeBSD 13.2 VMs running under KVM on a Linux machine.
Some code is using libcurl to make a request to an invalid domain and is
testing that the error is a resolution failure. This test passes on all
platforms except specifically in these FreeBSD VMs; I can't reproduce
locally on FreeBSD. That made me think that there's an issue with how the
VM was set up, prompting the original message and discussion. Then what
I recently found was that we set a 30-second timeout for the libcurl
request, which FreeBSD hits in the VM, as it evidently spends a full
30 seconds attempting to resolve the host, while e.g. Linux reports a
resolution failure immediately.

> Coincidentally, I'm experimenting with FreeBSD under Qemu on my Mac Mini M1 and seeing about 93 mbits/sec in iperf, regardless of the NIC configured.  ( VM to bare metal host )  Bare metal to bare metal shows 930 mbits/sec.


That's interesting, can you show how you did that? I'm not familiar with
iperf (or most things in the realm of networking). Do you know why it's
so much slower?