Technical information

Performance Best Practices for VMware vSphere 4.0
42 VMware, Inc.
 Make sure that power management scheme settings (both in the BIOS and in ESX) that cause CPU
frequency scaling are consistent between the hosts on which the primary and secondary virtual
machines run.
 Enabling CPU reservations for the primary virtual machine (which will be duplicated for the
secondary virtual machine) to ensure that the secondary gets CPU cycles when it requires them.
 Though timer interrupt rates do not significantly affect FT performance, high timer interrupt rates create
additional network traffic on the FT logging NIC. Therefore, if possible, reduce timer interrupt rates as
described in “Guest Operating System CPU Considerations” on page 31.