The philosophical problem I have with this suggestion is that 
I expect that the large majority of users will be more happy 
with disabled TSO if they use non standard qdiscs and 
defaults that do not fit the majority use case are bad.

Basically you're suggesting that nearly everyone using tc 
should learn about another obscure command.

If someone is using tc to load and configure a qdisc, I'd really hope
knowing or learning ethtool wouldn't be a stretch for them...  And I'm
not arguing the majority of people will want this or not, but taking
away the ability to use TSO at the kernel level here without allowing a
tuneable is making that decision for them, which is wrong IMO.

Cheers,

-PJ Waskiewicz
[off-list ref]