[Bug 290773] vtnet: Severe performance regression since D51686

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

--- Comment #18 from [email protected] ---
A commit in branch main references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=4c50ac68166caf7e08c5a9984d63fa91490fa50d

commit 4c50ac68166caf7e08c5a9984d63fa91490fa50d
Author:     Michael Tuexen <[email protected]>
AuthorDate: 2025-11-10 15:34:53 +0000
Commit:     Michael Tuexen <[email protected]>
CommitDate: 2025-11-10 15:34:53 +0000

    vtnet: fix enabling/disabling tso

    Transmit segment offloading depends on transmit checksum offloading.
    Enforce that constraint. This also fixes a bug, since if_hwassist bits
    are from the CSUM_ space, not from the IFCAP_ space.

    PR:                     290773
    Reviewed by:            Timo Völker
    Tested by:              [email protected]
    MFC after:              3 days
    Differential Revision:  https://reviews.freebsd.org/D53629

 sys/dev/virtio/network/if_vtnet.c | 28 ++++++++++++++++++++++++----
 1 file changed, 24 insertions(+), 4 deletions(-)

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