Hi Alex, On Wed, 2009-01-21 at 16:08 -0700, Alex Williamson wrote: > This is an attempt to improve the latency of virtio-net while not hurting > throughput. I wanted to try moving packet TX into a different thread > so we can quickly return to the guest after it kicks us to send packets > out. I also switched the order of when the tx_timer comes into play, so > we can get an inital burst of packets out, then wait for the timer to > fire and notify us if there's more to do. Here's what it does for me > (average of 5 runs each, testing to a remote system on a 1Gb network): > > netperf TCP_STREAM: 939.22Mb/s -> 935.24Mb/s = 99.58% > netperf TCP_RR: 2028.72/s -> 3927.99/s = 193.62% > tbench: 92.99MB/s -> 99.97MB/s = 107.51% > > I'd be interested to hear if it helps or hurts anyone else. Thanks, Avi and I went back and forth on this one in great detail before: http://www.mail-archive.com/kvm@xxxxxxxxxxxxxxx/msg06431.html Avi's arguments make a lot of sense, but looking over those patches again now, I still think that applying them would be a better approach than what we have right now. Cheers, Mark. -- 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
