Embedded network virtualization environment VirtIO (virtual input and output) network virtualization working method

Abstract

The invention provides an embedded network virtualization environment VirtIO virtualization working method. The embedded network virtualization environment VirtIO virtualization working method comprises, for a VirtIO front drive program, introducing a delay mechanism to a VirtIO network so that a client does not immediately transfer the control right to a host when performing network data I / O (input / output) but caching the data into a queue, and after a certain time, performs context switching to inform the host to obtain the data from the cache queue. The embedded network virtualization environment VirtIO virtualization working method can obviously reduce the number of times of context switching between the client and the host, save a large number of CPU (central processing unit) resources to process more network I / O. Experiments show that, within a set time delay, network throughput can be increased by more than three times.

Description

technical field [0001] The invention relates to an embedded system, in particular to a design method of a VirtIO front-end driver in an embedded network virtualization environment. Background technique [0002] Embedded systems are special-purpose systems that perform a few tasks. Different from traditional x86 platforms, embedded environments have the characteristics of low power consumption and weak computing power, and have different performance models. Embedded systems need frequent interactions with the physical world, but due to the resource constraints of embedded systems, the performance of I / O virtualization in embedded virtualization environments has become an important technical indicator of embedded virtualization technology. In the embedded virtualization environment, the performance of I / O virtualization needs to ensure that the overall performance of the hardware device is stable within a certain expansion range, and can meet the resource requirements of each ...

AI Technical Summary

Problems solved by technology

The paravirtualized I / O virtualization has better performance, but its disadvantage is that the virtual machine needs to modify the system driver to realize the correspondence between the front and back end drivers; the third is hardware-supported virtualization, through hardware support, virtual After the authorization of VMM, the computer system can directly access the hardware device without forwarding the request of VMM.

This bottleneck shows that the CPU utilization rate is completely saturated when the number of clients is 2 or more, that is to say, the system cannot process more data packets quickly, and almost all CPU clocks are used to process network data transmission and reception. In this process, the main overhead is the switching between the client and the host (VM Exit).

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