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Date:      Thu, 01 Feb 2024 07:42:26 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 276760] vtnet driver incorrectly calculates checksums
Message-ID:  <bug-276760-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D276760

            Bug ID: 276760
           Summary: vtnet driver incorrectly calculates checksums
           Product: Base System
           Version: 13.2-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: cryptogranny@gmail.com

I've got two free virtual machines in Oracle Cloud to run a VPN service the=
re.
I've noticed that the network speed was ok with direct connection, but was
extreamly slow, when traffic crosses vtnet and VPN interfaces (tried both I=
Psec
and OpenVPN).

Adding hw.vtnet.csum_disable=3D1 fixed the problem. Seems like it is for a =
while
in the wild, and still not fixed.

https://serverfault.com/questions/817664/slow-network-fixed-adding-hw-vtnet=
-csum-disable-1-what-are-the-posible-side-effe

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