[Xen-devel] Question about Virtual NIC I/O performance

[topperxin <topperxin@xxxxxxx>]

Hi all

       Now I'm studying the Virtual NIC I/O performance, I have some questions

       1:

       For 1G NIC, such as Intel 82576, if I use pv driver as the VM NIC driver, for the best case, 

       I can get a good performance, maybe 900M bps

       So we can say the pv driver's performance is very good.

       While when I use 10G NIC, such as Intel 82599,  still use the pv driver as the VM NIC driver,

       the I/O performance is very bad, there is only 2G bps, the testing environment is simple, one vm on one host.

       So, may I draw a conclusion that PV driver not suitable for 10G NIC?

       Who can tell me the reason?

       2:

       For 10G NIC, Intel 82599, if I open the SR-IOV function, I can get a good performance in the vm, 

       it's nearly to 9.2G bps

       3:

       We all know AWS's EC2 instance are based on XEN.

       I launched the instance which provide the 10G performance I/O

       I tested and got the best performance the 6.3G bps

       I checked the driver of the VM's NIC, it's PV driver, not the SR-IOV

       How does AWS can use PV driver on 10G NIC get 6.3G bps performance? It's very good, I think

       Any discussion are welcome

       Best Regards

       Lixin Niu   

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