LDAP High Latency with ESXi 6

We have HP Gen9 with Emulex 10Gb (Driver v10.5.121.7) running latest ESXi 6.0 and experience high latency of above 50ms to 1.5 seconds with LDAP queries between Windows DC to DC or VM to DC.   However, moving the DC to a ESXi 5.5/6.0 with 1Gb network latency is down to below 50ms.  If you just ping the two servers, ping response is <1ms.

Anyone else experiencing such issue? It appears to happen with ESXi 6.0 with 10Gb Networki.   ESXi 5.5 on 10Gb appears to work fine. 

>50ms up to 1.8 seconds in query time

ESXi6 DC VM to ESXi DC VM on the same host, 10Gb DSwitch

ESXi6 DC VM to ESXi DC VM on different host, 10Gb DSwitch

<50ms

Physical DC to Physical DC

ESXi5.5/6.0 DC VM to ESXi5.5/6.0 DC VM on 1Gb Network (Ping is <1ms, FIle copy is > 100MB/sec)

I've checked packet drops with esxtop with network view, no packet drops.

I used the following script for measurement which does 10 queries for a user and takes the average time.

The result is fairy consistent.

http://social.technet.microsoft.com/wiki/contents/articles/26227.how-to-measure-the-response-time-of-your-domain-controllers-when-running-an-ldap-query.aspx