Network card interrupt control method for a plurality of virtual machines

Abstract

The invention relates to a virtual network card interrupt control method for a plurality of virtual machines, which comprises the following steps: reading a descriptor of a data packet firstly to obtain information of a DMA source address, a destination address, length, and the like when a network card receives or transmits the data packet; then, executing DMA operation, back writing the descriptor after the operation is completed; counting by a counter corresponding to a virtual machine queue; transmitting an interrupt request when a numerical value of the counter reaches a preset time threshold value; carrying out the counting operation of the counter when the counter operates; when the numerical value of the counter reaches a preset time threshold value, judging whether the data packetcompletes the operation or not, if completing the operation, transmitting the interrupt request, otherwise, transmitting the interrupt request after the data packet completes the operation, and setting immediate interrupt operation without being restrained by the two threshold values as required. The network card interrupt control method completes the interrupt operation of the original software layer by hardware, completely releases the CPU and reduces the utilization ratio of the CPU, and meanwhile, because the processing speed of the hardware is greatly higher than the processing speed of the software, the data processing speed is greatly increased.

Description

technical field [0001] The invention provides an interrupt control method of a high-speed network card, and in particular relates to a virtual network card interrupt control method for multi-virtual machine applications. Background technique [0002] Generally speaking, for a 10M or 100M network card, its hardware interrupt is interrupted once every data packet comes. This method can work normally when the data flow is below 100M. But in the 1000M network card, this method is generally not used, because the large data flow will cause the system at the receiving end to crash. This is because high-speed data streams generate too many interrupts, and the CPU spends all of its time handling interrupts without any system resources to pass arriving packets to the application for processing or forwarding. For this reason, a hardware technology called Interrupt Batching is introduced in the design of Gigabit network cards. The network card using this technology will generate inter...

AI Technical Summary

Problems solved by technology

However, the softswitch of the traditional virtual machine monitor (Virtual Machine Monitor) realizes the sharing of network devices by multiple virtual machines, which obviously reduces the processing performance of the network card I / O interface, increases the response time of data packet processing, and occupies a high CPU usage, such as figure 1 shown

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