[Bug 259249] vtnet: Checksum offloading enabled reduces pf NAT performance (~100mbps -> ~200kbps)

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=259249

--- Comment #7 from [email protected] ---
(In reply to Michael Tuexen from comment #5)

VM Setup instructions roughly:

install FreeBSD 14.3 from ISO image, ZFS-based (amd64 machine - CX23 on
hetzner)
freebsd-update fetch && freebsd-update install 

pkg update
pkg install speedtest-go cbsd

/usr/local/cbsd/sudoexec/initenv /usr/local/cbsd/share/initenv.conf
default_vs=1 workdir=/jails 

# CBSD will create basic pf nat rules and bridge interface - cbsdbr0 with
10.0.0.1/24

cbsd jcreate jname=speedtest vnet=1 interface=cbsdbr0
sysrc=defaultrouter=10.0.0.1 astart=1
cbsd jstart speedtest
cbsd jlogin speedtest 

jail# pkg install speedtest-go
jail# speedtest-go --server 60469

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