On Sun, Nov 29, 2015 at 10:31:10PM -0500, David Miller wrote: > 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. There's a minor bug there, but once it's fixed - I agree, it belongs in the vhost tree. -- MST -- 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
