Changes in the network interface queueing handoff model

[Andrew Gallatin]

Robert Watson writes:
 > 
 > Jack Vogel at Intel has previously talked about having TSO patches for FreeBSD 
 > to use with if_em, but was running into stability/correctness problems on 7.x. 
 > I e-mailed him a few minutes ago to ask to take a look at the patches.  Since 
 > I've not yet seen them, I don't know the details of how they work -- I assume 
 > that some amount of tweaking is required not just to TCP so that it passes 
 > down larger segments, but so that larger segments are used in the right ways, 
 > and in keeping with the facilities offered by the underlying interface, 
 > especially before a routing decision has been made.

I'm not sure about what stack changes are required for TSO.
I do know that NetBSD has had TSO for roughly 2 years, so they
might be a good place to look..

Drew