[Bug 290773] vtnet: Severe performance regression since D51686

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From: <bugzilla-noreply_at_freebsd.org>
Date: Tue, 04 Nov 2025 12:09:23 UTC

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

--- Comment #5 from Michael Tuexen <tuexen@freebsd.org> ---
> And the "dev.vtnet.0.tx_tso_without_csum" is increasing during the test.
That is the crucial point. This error condition leads to packet drops. 
I also observed that TXCSUM is not enabled on vtnet0. Is that intentional?
Do you have review D52765 in the tree?
Just to double check: In the VM you don't use any additional network feature
like jails with epairs, NAT or any sort of IP forwarding or any tunnel
interface over vtnet?

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