A cloud computing system which is configured to monitor operating status of a plurality of virtual computing machines running on a physical computing machine, wherein said monitoring includes monitoring a cycles per instruction (CPI) parameter and a cache miss rate (CMR) parameter of at least one of the plurality of virtual computing machines. The system detects interference in the operation of the at least one virtual machine, with the detection including determining when at least one of the CPI and CMR values exceed a predetermined threshold. When interference is detected, the system reconfigures a load balancing module associated with the virtual machine in question to send fewer requests to the virtual machine.