From: Jason Wang <jasowang@xxxxxxxxxx> Date: Wed, 25 Nov 2015 15:11:26 +0800 > This series tries to add basic busy polling for vhost net. The idea is > simple: at the end of tx/rx processing, busy polling for new tx added > descriptor and rx receive socket for a while. The maximum number of > time (in us) could be spent on busy polling was specified ioctl. > > Test A were done through: > > - 50 us as busy loop timeout > - Netperf 2.6 > - Two machines with back to back connected ixgbe > - Guest with 1 vcpu and 1 queue > > Results: > - For stream workload, ioexits were reduced dramatically in medium > size (1024-2048) of tx (at most -43%) and almost all rx (at most > -84%) as a result of polling. This compensate for the possible > wasted cpu cycles more or less. That porbably why we can still see > some increasing in the normalized throughput in some cases. > - Throughput of tx were increased (at most 50%) expect for the huge > write (16384). And we can send more packets in the case (+tpkts were > increased). > - Very minor rx regression in some cases. > - Improvemnt on TCP_RR (at most 17%). Michael are you going to take this? It's touching vhost core as much as it is the vhost_net driver. _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/virtualization
