[Bug 234624] FreeBSD 12.0 TX network regression from 11.2 - potentially caused by TSO

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234624

--- Comment #1 from Nick <freebsd at aoeu.uk> ---
Hi,

I've done some additional testing:

-Failing over to the igb interfaces doesn't show any problems with TSO enabled
or disabled, so this is probably specific to ix

-Dropping the MTU to 1500 has no effect

-Removing an ix interfaces from its lagg and configuring an untagged interface
directly on it doesn't shows significantly but improved TX performance, however
this is seen with TSO enabled and disabled.  I haven't managed to rule out the
switch configuration as the cause of this yet, as I don't normally have any
untagged ports.

I'll update in a bit when I've done some more testing with the untagged
interface configuration.

Kind regards,

Nick

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