Sorry, I forgot to copy-paste one of the results :) On Wed, 2011-11-30 at 18:11 +0200, Sasha Levin wrote: > I did some testing of indirect descriptors under different workloads. > > All tests were on a 2 vcpu guest with vhost on. Simple TCP_STREAM using > netperf. > > Indirect desc off: > guest -> host, 1 stream: ~4600mb/s > host -> guest, 1 stream: ~5900mb/s > guest -> host, 8 streams: ~620mb/s (on average) > host -> guest, 8 stream: ~600mb/s (on average) > > Indirect desc on: > guest -> host, 1 stream: ~4900mb/s > host -> guest, 1 stream: ~5400mb/s > guest -> host, 8 streams: ~620mb/s (on average) > host -> guest, 8 stream: ~600mb/s (on average) Should be: host -> guest, 8 stream: ~515mb/s (on average) > > Which means that for one stream, guest to host gets faster while host to > guest gets slower when indirect descriptors are on. > -- Sasha. -- 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
