We're really interested to hear how weave fast datapath works out in all kinds of environments, which is why we put the preview out. It's a shame that Arjan's post did not include numbers for FDP, but maybe he'll be able to include them in an update.
Our answer to weave performance concerns is on its way: http://blog.weave.works/2015/06/12/weave-fast-datapath/
We're really interested to hear how weave fast datapath works out in all kinds of environments, which is why we put the preview out. It's a shame that Arjan's post did not include numbers for FDP, but maybe he'll be able to include them in an update.