On Mon, 05/23 10:17, Paolo Bonzini wrote: > > > On 23/05/2016 04:43, Fam Zheng wrote: > > > The batch notification BH needs to know which virtqueues to notify when > > > multiqueue is enabled. Use a bitmap to track the virtqueues that with > > > pending notifications. > > > > This approach works great as long as VQs are in the same iothread. An > > alternative way would be using separate BH per VQ, which will naturely work > > with > > multi queue block layer in the future. Should we just go for that in the > > first > > place? Seems less code churn, and no imaginable disadvantage compared to > > this > > patch. > > It can be slower because all BHs are walked during aio_bh_poll, not just > the scheduled ones. >
OK, this is a fair point. Thanks. Fam
