I built out a current release of the turnkey file server (samba). Pretty much stock build from ovf into VMware 5.1 host. It is accessing a PRDM volume hosted on a local SAN. My xfer speeds are in the 8-11MB a second range. 

Also on this same VMware host I have a Windows 2008 core system sharing a volume hosted on the same local SAN. My xfer speeds are in the 30-50MB a second range. 

Is there any know issues with the Flexable network card driver (from the 3rd party vmwaretools pre-installed on the Turnkeys) or perfomance tweeks that should be made on SAMBA? 

Just looking for any known gotchas before I go digging.