On 02/12/2014 02:46 PM, Qin Chuanyu wrote: > On 2014/2/12 13:28, Jason Wang wrote: > >> A question: without NAPI weight, could this starve other net devices? > tap xmit skb use thread context，the poll func of physical nic driver > could be called in softirq context without change. > > I had test it by binding vhost thread and physic nic interrupt on the > same vcpu, use netperf xmit udp, test model is VM1-Host1-Host2. > > if only VM1 xmit skb, the top show as below : > Cpu1 :0.0%us, 95.0%sy, 0.0%ni, 0.0%id, 0.0%wa, 0.0%hi, 5.0%si, 0.0%st > > then use host2 xmit skb to VM1, the top show as below : > Cpu1 :0.0%us, 41.0%sy, 0.0%ni, 0.0%id, 0.0%wa, 0.0%hi, 59.0%si, 0.0%st > > so I think there is no problem with this change. Yes, I realize it was ok after Eric's comment. Thanks -- 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
