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centos 提供了tuned-adm，其原理是改变sysctl的参数来调节kernel在不同场景下的性能例如目前提供的场景如下：[root@localhost pci]# tuned-adm listAvailable profiles:- balanced                    - General non-specialized tuned profile- desktop                     - Optimize for the desktop use-case- latency-performance         - Optimize for deterministic performance at the cost of increased power consumption- network-latency             - Optimize for deterministic performance at the cost of increased power consumption, focused on low latency network performance- network-throughput          - Optimize for streaming network throughput, generally only necessary on older CPUs or 40G+ networks- powersave                   - Optimize for low power consumption- throughput-performance      - Broadly applicable tuning that provides excellent performance across a variety of common server workloads- virtual-guest               - Optimize for running inside a virtual guest- virtual-host                - Optimize for running KVM guestsCurrent active profile: network-throughput当前正在应用的场景[root@localhost pci]# tuned-adm activeCurrent active profile: network-throughput可以通过sysctl -a  > 2.txt 将所有的sysctl参数改到文件中，然后比较两种场景下的sysctl的区别

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