Abstract:

For the Xen network model, high load under the environment of network causes bottleneck of the system where most CPU resources are occupied by frequent interrupt from the NIC. To alleviate this problem, an adaptive interrupt latency scheduling mechanism based on Xen is proposed, which uses the polling or interrupt method in accordance with the queue length of virtual buffer without supplementing any additional processing units. And the mechanism can guarantee different qualities of service to some extent through the definition of the two types of priority virtual buffers. Experimental results show that, when frequent interrupt from the NIC occurs, CPU will not be interrupted frequently so that the CPU utilization is improved.

Key words: virtualization;interrupt;latency;virtual buffer