Add new sections to the README: * performance tuning (intr coal, regcache, wire-compat, ethertype) * MX API and wire compat
Add new sections to the README:
* performance tuning (intr coal, regcache, wire-compat, ethertype)
* MX API and wire compat

Add notes about the required MTU.



git-svn-id: 29c1264a5cf5e3532df57b06678e7347571c1a3c@773 f1ba3bf5-cb5c-402b-92a9-7c6bdc83a356

ananos/open-mx,ananos/xen2mx,ananos/xen2mx,ananos/open-mx,ananos/xen2mx,ananos/open-mx,ananos/xen2mx