An efficient and low-latency interrupt passthrough method based on device passthrough
Aiming at the problem that the virtual central processing unit(CPU)scheduling delay of symmetric multi-pro-cessing(SMP)virtual machine(VM)will reduce the virtual machine input/output(I/O)responsiveness,an effi-cient and low-latency interrupt passthrough method based on device passthrough is proposed in this paper.Based on hardware-assisted technology,this method builds an interrupt pass-through architecture,and designs an interrupt redirection mechanism to redirect interrupts from the preempted vCPUs to running ones.The experimental results show that the round-trip time of the network is reduced by an average of 34.1％,the throughput is increased by up to 7.9％,and the time required for each server request with Apache test is reduced by an average of 13.6％,and the average latency of disk I/O operations is reduced by 6.7％～8.4％.The experimental results demonstrate that this method can effectively reduce the impact of virtual machine vCPU scheduling on I/O latency and improve virtu-al machine I/O responsiveness.
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维普
