This is a patch-set for deferring skb allocation based on Rusty and Michael's inputs. Guest virtio_net receives packets from its pre-allocated vring buffers, then it delivers these packets to upper layer protocols as skb buffs. So it's not necessary to pre-allocate skb for each mergable buffer, then frees it when it's useless. This patch has deferred skb allocation when receiving packets for both big packets and mergeable buffers. It reduces skb pre-allocations and skb_frees. A destroy function has been created to push virtio free buffs to vring for unused pages, and used page private to maintain page list. This patch has tested and measured against 2.6.32-rc7 git. It is built again 2.6.32 kernel. Tests have been done for small packets, big packets and mergeable buffers. The single netperf TCP_STREAM performance improved for host to guest. It also reduces UDP packets drop rate. Thanks Shirley -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
