promiscuous mode causes 100% packet loss on dvportgroup or packet flooding

hi ,

I have a classic case where in the vDS has multiple dvportgroups with individual physical nics as uplinks.

1/2 case - enabling promiscuous mode on the dvportgroup is causing the flooding of packets to other ports on the dvportgroup , even though the source is sending packet in a back to back connected setup. The network performance is just unbelievable low! i.e. 10+ Mpps payload gives a throughtput of 600K on the vmnic.

2/2 case - disabling promiscuous mode on the dvportgroup causes 100% packet loss. no network packt flows until this security setting is enabled.

Could someone explain as to what might be causing this?

Thanks,

Suma