On 02/12/14 08:30, zhangleiqiang wrote: > Hi, all > I am testing the performance of xen netfront-netback driver that > with multi-queues support. The throughput from domU to remote dom0 is > 9.2Gb/s, but the throughput from domU to remote domU is only 3.6Gb/s, I > think the bottleneck is the throughput from dom0 to local domU. However, > we have done some testing and found the throughput from dom0 to local > domU is 5.8Gb/s. > And if we send packets from one DomU to other 3 DomUs on different > host simultaneously, the sum of throughout can reach 9Gbps. It seems > like the bottleneck is the receiver? > After some analysis, I found that even the max_queue of > netfront/back is set to 4, there are some strange results as follows: > 1. In domU, only one rx queue deal with softirq > 2. In dom0, only two netback queues process are scheduled, other two > process aren't scheduled.
Multiqueue only has benefits if you have multiple flows since the source/destination addresses are hashed to a queue number. This probably explains why only some of the queues are being used in your test. David _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
