Name	Description
celsius	*Since*
joule	*Since*
kiloBytes
kiloBytesPerSecond
megaBytes
megaBytesPerSecond
megaHertz
microsecond	*Since*
millisecond
number
percent
second
teraBytes	*Since*
watt	*Since*

         <simpleType xmlns="http://www.w3.org/2001/XMLSchema" xmlns:vim25="urn:vim25" name="PerformanceManagerUnit">
            <restriction base="xsd:string">
               <enumeration value="percent"/>
               <enumeration value="kiloBytes"/>
               <enumeration value="megaBytes"/>
               <enumeration value="megaHertz"/>
               <enumeration value="number"/>
               <enumeration value="microsecond"/>
               <enumeration value="millisecond"/>
               <enumeration value="second"/>
               <enumeration value="kiloBytesPerSecond"/>
               <enumeration value="megaBytesPerSecond"/>
               <enumeration value="watt"/>
               <enumeration value="joule"/>
               <enumeration value="teraBytes"/>
               <enumeration value="celsius"/>
            </restriction>
         </simpleType>

Enum - PerformanceManagerUnit(vim.PerformanceManager.CounterInfo.Unit)

Enum Description