Open Source Summit Europe + ELC Europe 2017

Millions of users are deploying their services in Alibaba Cloud which based on KVM. The performance and capacity of KVM are two critical indicator for the whole system. In this presentation, Yang will demonstrate some real performance issues that reported by end users pertained to KVM, and the structural way to analyze and solve the problems. The performance tuning involves timer, IPI, memory and scheduler. In this implementation, lots of KVM specified features like exit-less timer, PV interrupt and VCPU ware scheduler in Linux kernel and KVM are systematically developed and deployed, which will be submitted to KVM community soon. At the end, numbers of performance improvements data of Alibaba Cloud after the overall optimization are showed in the presentation, and certain open-loop issues that still not handled well in KVM which are important to end customers are raised up to audiences.