| 吕晨* ** ***,张福新* ** ***,朱琛****,毛碧波****,邓平科*****,潘筱涵*****.面向设备直通的高效低延时的中断直通方法[J].高技术通讯(中文),2024,34(8):842~853 |
| 面向设备直通的高效低延时的中断直通方法 |
| An efficient and low-latency interrupt passthrough method based on device passthrough |
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| DOI：10. 3772 / j. issn. 1002-0470. 2024. 08. 006 |
| 中文关键词: 中断重映射； 输入/输出(I/O)虚拟化； 设备直通； 基于内核的虚拟机（KVM）； I/O响应性 |
| 英文关键词: interrupt remapping, input/output (I/O) virtualization, device passthrough, kernel-based virtual machine（KVM）, I/O responsiveness |
| 基金项目: |
| 作者 | 单位 | | 吕晨* ** *** | （*处理器芯片全国重点实验室(中国科学院计算技术研究所)北京 100190)
（**中国科学院计算技术研究所北京 100190)
（***中国科学院大学北京 100049)
（****龙芯中科技术股份有限公司北京 100190)
（*****中国移动通信有限公司研究院北京 100032） | | 张福新* ** *** | | | 朱琛**** | | | 毛碧波**** | | | 邓平科***** | | | 潘筱涵***** | |
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| 中文摘要: |
| 针对对称多处理器（SMP）虚拟机（VM）的虚拟中央处理器（vCPU）调度延迟会降低虚拟机输入/输出(I/O)响应性的问题，本文基于设备直通提出了一种高效低延迟的中断直通方法。该方法基于硬件辅助技术，搭建了中断直通架构，并设计了中断重定向机制，将直通设备中断从被抢占的vCPU重定向至正在运行的vCPU。实验结果表明，网络往返时延平均减少了34.1%，吞吐量最高提升7.9%，Apache测试每个服务器请求所需时间平均减少了13.6%，磁盘I/O操作时延平均减少了6.7%~8.4%。实验结果证明，该方法能有效减少虚拟机虚拟CPU调度对I/O延迟的影响，提高虚拟机I/O响应性。 |
| 英文摘要: |
| Aiming at the problem that the virtual central processing unit (CPU) scheduling delay of symmetric multi-processing (SMP) virtual machine（VM） will reduce the virtual machine input/output (I/O) responsiveness, an efficient 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 virtual machine I/O responsiveness. |
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