Mellanox ConnectX-3 VF driver can't work with 16 CPUs?

Hi, 
While trying SR-IOV with a Linux guest running on Hyper-V, I found this issue:
the VF driver can't work if the guest has 16 virtual CPUs (less vCPUs, e.g. 8,  can work fine):

[    9.927820] mlx4_core: Mellanox ConnectX core driver v2.2-1 (Feb, 2014)
[    9.927882] mlx4_core: Initializing b961:00:02.0
[    9.970994] mlx4_core b961:00:02.0: Detected virtual function - running in slave mode
[    9.976783] mlx4_core b961:00:02.0: Sending reset
[    9.985858] mlx4_core b961:00:02.0: Sending vhcr0
[   10.004855] mlx4_core b961:00:02.0: HCA minimum page size:512
[   10.010465] mlx4_core b961:00:02.0: Timestamping is not supported in slave mode
[   10.203065] mlx4_core b961:00:02.0: Failed to initialize event queue table, aborting
[   10.226728] mlx4_core: probe of b961:00:02.0 failed with error -12

I'm using the mainline kernel (4.10.0-rc4).

Any idea?

Thanks,
-- Dexuan