2016-08-23 16:10, Yuanhan Liu: > One thing worth noting while using Tx zero copy is the nb_tx_desc has > to be small enough so that the eth driver will hit the mbuf free > threshold easily and thus free mbuf more frequently. > > The reason behind that is, when Tx zero copy is enabled, guest Tx used > vring will be updated only when corresponding mbuf is freed. If mbuf is > not freed frequently, the guest Tx vring could be starved.
I think you should explain this behaviour in the doc of the vhost flag.
