On Mon, Jan 23, 2017 at 10:46 AM, Xiangning Yu <yuxiangn...@gmail.com> wrote: > Hi netdev folks, > > It looks like we call dev_forward_skb() in veth_xmit(), which calls > netif_rx() eventually. > > While netif_rx() will enqueue the skb to the CPU RX backlog before the > actual processing takes place. So, this actually means a TX skb has to > wait some un-related RX skbs to finish. And this will happen twice for > a single ping, because the veth device always works as a pair?
For me it is more like for the completeness of network stack of each netns. The /proc net.core.netdev_max_backlog etc. are per netns, which means each netns, as an independent network stack, should respect it too. Since you care about latency, why not tune net.core.dev_weight for your own netns?
