[Bug 290773] vtnet: Severe performance regression since D51686

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From: <bugzilla-noreply_at_freebsd.org>
Date: Mon, 03 Nov 2025 21:20:12 UTC

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=290773

--- Comment #2 from mike@sentex.net ---
Created attachment 265139
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=265139&action=edit
iperf3 tests on 13,14,15

I am running kvm on an older Xeon with 10-Gigabit X540-AT2 NICs. Its not the
fastest box, but here are some baselines attached from STABLE 13,14,15 guests
running iperf3
192.168.122.1 is the hypervisor
.13 = stable 13 
.14 = stable 14
.15 = stable 15

stable 15 is the king out of the box at least. If I disable tso on RELENG_15 it
performs much like the others. 
The 3 VMs are all on the same KVM box with no other VMs running at the time.

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