Today I worked with Symantec (Still have an open case) and they claim the SEPM (Management Console) is the culprit and we upgraded it to the latest version. The only fix for this that I have found is to uninstall SEP completely although this is not a preferred fix. With 12.1.6a installed on both VM's our throughput is kicked down to 1.8 Gbps maximum throughput using the same tests.
(I believe 8Gbps is the maximum Windows will do by default with a single thread due to a QOS GPO setting) After installing Symantec Endpoint Protection Client 12.1.6 a (or 12.1.4 or seems any version of 12.1) our bandwidth is severly imparied. The clients only had Java, JPerf, and VMware Tools for the VMxnet3 adapter drivers. Using JPerf to test the network throughput we are getting a solid 8Gbps throughput between these clients. We have installed fresh copies of Windows Server 2012 R2 as 2 Virtual Machines running on the same host. Summary of our issue: We have a new 10 Gb virtual Infrastructure running ESXi 5.5 U3.
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