[willscott]

V4 has many more things going on (it's stateful, has a much more complicated locking system integrated, and adds some other points of complexity that get better performance). More than I was ready to take on for a first pass :)

[anderspitman]

You had me at stateful

[yencabulator]

For what it's worth, stateful is a good thing; NFSv4 leases are what allows it to safely do more aggressive caching than NFSv3. Back when it was new, benchmarks showed a good speed increase all around...

[anderspitman]

Stateful isn't inherently good or bad. It's a tradeoff. But the more programming I do the less I think it's a tradeoff worth making.

[yencabulator]

In the context of NFS, it's a trade-off that enabled higher performance (and some new features too).