Michael S. Tsirkin wrote: > Hi! > I see this in virtio_ring.c: > > /* Put entry in available array (but don't update avail->idx * > until they do sync). */ > > Why is it done this way? > It seems that updating the index straight away would be simpler, while > this might allow the host to specilatively look up the buffer and handle > it, without waiting for the kick. Even better, if the host updates a location containing which index it has seen recently, you can avoid the kick entirely during sustained flows - just like your recent patch to avoid sending irqs to the guest. -- Jamie _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/virtualization
