On 2018/06/30 1:38, Michael S. Tsirkin wrote: ... >> Performance numbers: >> >> - Bulk transfer from guest to external physical server. >> [Guest]->vhost_net->tap--(XDP_REDIRECT)-->i40e --(wire)--> [Server] >> - Set 10us busypoll. >> - Guest disables checksum and TSO because of host XDP. >> - Measured single flow Mbps by netperf, and kicks by perf kvm stat >> (EPT_MISCONFIG event). >> >> Before After >> Mbps kicks/s Mbps kicks/s >> UDP_STREAM 1472byte 247758 27 >> Send 3645.37 6958.10 >> Recv 3588.56 6958.10 >> 1byte 9865 37 >> Send 4.34 5.43 >> Recv 4.17 5.26 >> TCP_STREAM 8801.03 45794 9592.77 2884 >> >> Signed-off-by: Toshiaki Makita <makita.toshiaki@xxxxxxxxxxxxx> > > Is this with busy poll enabled? Yes, as I wrote "Set 10us busypoll" above. > Are there CPU utilization #s? I used one cpu for one vcpu and one cpu for one vhost. Each host cpu for vcpu/vhost was like this: - Before vcpu cpu : %guest 70 %sys 30 vhost cpu: %sys 100 - After vcpu cpu : %guest 100 vhost cpu: %sys 100 I think %sys before patch was caused by vring kick. -- Toshiaki Makita
