De esta página em relação a balance-rr
:
This mode is the only mode that will permit a single TCP/IP connection to stripe traffic across multiple interfaces. It is therefore the only mode that will allow a single TCP/IP stream to utilize more than one interface's worth of throughput. This comes at a cost, however: the striping often results in peer systems receiving packets out of order, causing TCP/IP's congestion control system to kick in, often by retransmitting segments.
E em relação a 802.3ad
:
The 802.3ad standard also mandates that frames be delivered in order (within certain limits), so in general single connections will not see misordering of packets.
Portanto, o 802.3ad fornece uma melhor ordenação de pacotes que evita as retransmissões TCP.