sadly , still someone think reordering is just fine ( and ok with TCP!)

http://blog.ipspace.net/2015/02/per-packet-load-balancing-on-wan-links.html
http://blog.ipspace.net/2014/03/per-packet-load-balancing-interferes.html
http://blog.ipspace.net/2010/12/multi-chassis-link-aggregation-mlag-and.html

Having conversation with senior network engineer . Sadly , there are still someone think reordering is fine ( and ok with TCP!)
Please just listen to Ivan!

BTW, JUNOS's "per-packet" keyword is "per-flow"

Also , please check Brocade
http://blog.ipspace.net/2011/04/brocade-vcs-fabric-has-almost-perfect.html