[Bug 290773] vtnet: Severe performance regression since D51686

From: <bugzilla-noreply_at_freebsd.org>
Date: Mon, 03 Nov 2025 19:38:01 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=290773

--- Comment #1 from Michael Tuexen <tuexen@freebsd.org> ---
(In reply to lg from comment #0)
A couple of clarification questions:
* For reproducing the issue you copy a file from the VM to some other host?
* Is the other host another VM running in parallel to the FreeBSD VM?
* Is the other host a physical host?
* Are you running any sort of NAT/Firewall on the FreeBSD VM?
* Could you provide the output of ifconfig vtnet0?
* Could you provide the output of sysctl hw.vtnet
* Could you provide the output of sysctl dev.vtnet.0
* Could you run tcpdump -i vtnet0 -w out.pcap and share the .pcap file (a
couple of seconds should be enough).

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