[Bug 290773] vtnet: Severe performance regression since D51686

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

--- Comment #9 from lg@efficientip.com ---
(In reply to Michael Tuexen from comment #8)
Yes in my rc.conf originaly I had this 

ifconfig_vtnet0="up  media autoselect mtu 1500 -txcsum"
ifconfig_vtnet0_alias0="inet 12.0.251.19 netmask 255.255.0.0"

With that setup I have the issue, but if I use change my config to:

ifconfig_vtnet0="up"
ifconfig_vtnet0_alias0="inet 12.0.251.19 netmask 255.255.0.0"

It is working fine.



So for me the issue happen only when TXCSUM is disabled and TSO4 enabled

To resume if 
TXCSUM is enabled and TSO4 enabled => no issue
TXCSUM is enabled and TSO4 disable => no issue
TXCSUM is disabled and TSO4 enabled  => not working ( cf the pcap ) 
TXCSUM is disabled and TSO4 disable => no issue

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