I/O request processing method and device

Abstract

The invention provides an I / O request processing method and device. CPU cores are divided into an interrupt processing set and a business process set, interruption is fixedly processed in part of the CPU cores which are separated from the CPU cores for processing business I / O, the problem that due to the abrupt arrival of interruption, the business I / O instantaneous time delay suddenly becomes larger is avoided, the time delay stability of the system is improved, the CPU cores in the business process set are further divided into groups, the mapping relation between LUNs and CPU groups is established, each CPU group processes I / O requests on a fixed LUN, conflict generated when I / O on each CPU core starts contention for the shared resource on the same LUN is reduced, the CPU cache hit ratio is increased, and the whole performance of the system is improved.

Description

technical field [0001] Embodiments of the present invention relate to communication technologies, and in particular to a method and device for processing input / output (Input / Output, I / O for short) requests. Background technique [0002] All-flash arrays are required to provide stable latency under certain I / O pressures. In addition to traditional resource reservation and flow control strategies based on concurrency, the system design also requires avoiding latency jitter introduced by various interference sources. To improve the stability of delay. [0003] In the prior art, all interrupt assignments are executed on each central processing unit (Central Processing Unit, referred to as CPU) core, which will interrupt the business I / O being processed on the current core due to the randomness and burstiness of the interrupt I / O. The execution of O increases the instantaneous delay of service I / O, which affects the delay stability of service I / O. When the I / O on each core acce...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, all interrupt assignments are executed on each central processing unit (Central Processing Unit, referred to as CPU) core, which will interrupt the business I / O being processed on the current core due to the randomness and burstiness of the interrupt I / O. The execution of O causes the instantaneous delay of business I / O to increase, which affects the delay stability of business I / O

When the I / O on each core accesses the same shared resource, access conflicts will occur, and other CPU cores need to wait for the previous CPU core to complete the access before accessing, resulting in increased service I / O delay, CPU The cache hit rate will also decrease

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