ESXi processor microcode patching

1. Download microcode patch from Intel site.
2. Copy the microcode.dat file to your ESXi box.
3. Edit /etc/rc.local and add the command to load the microcode on every boot:

    /sbin/vmkmicrocode -f /microcode.dat

See http://www.v-front.de/2013/07/faq-cpu-microcode-updates-and-vmware.html