Hello Michael, On Wed, 2009-10-28 at 17:39 +0200, Michael S. Tsirkin wrote: > Here's another hack to try. It will break raw sockets, > but just as a test: This patch looks better than previous one for guest to host TCP_STREAM performance. The transmission queue full still exists, but TCP_STREAM results is 43xxMb/s (userspace is about 3500Mb/s). When I increase the transmission queue size to 1K, The performance burst up to 53xxMb/s. But some runs I still hit several transmission queue full in 60 secs run even with 1K queue size. Thanks Shirley -- 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