Long reply times for local computers

Hi

I have about 5 servers that are having network performance issues ... when you try to ping these servers you can some packet lost [~150 for 12 hours pings] and average time to reply is approximately 7ms. For rest of couple dozen servers you get nearly no packet lost and average reply time is 0 ms.

trace route shows 1 hop.

Most of my servers are running on VMware Esxi ... not all of these are on the same physical server.

No errors are reported on esxi servers ...

Any thoughts ....