虚拟机虚拟化cpu性能

Most time, we need to tune system parameters to achieve better performance but what the general parameters to be tuned in Linux systems.

大多数时候，我们需要调整系统参数以获得更好的性能，但是需要调整Linux 系统中的一般参数。

I think you may want to add following parameters to Kernel boot (/etc/default/grub) parameters

我认为您可能想在内核启动（/ etc / default / grub）参数中添加以下参数

intel_idle.max_cstate=0 processor.max_cstate=0 idle=poll intel_pstate=disable复制

At the same time, you may also want to shutdown/open Pause Loop Exiting (PLE). See [2] [3] for more details about PLE, and see [1] [4] for more details about Intel C-States and P-States.

同时，您可能还想关闭/打开“暂停循环退出”（PLE）。 有关PLE的更多详细信息，请参见[2] [3]，有关Intel C状态和P状态的更多详细信息，请参见[1] [4]。

How to Shutdown PLE:

如何关闭PLE：

sudo rmmod kvm_intel
sudo modprobe kvm_intel ple_gap=0 ple_window=0
cat /sys/module/kvm_intel/parameters/ple*复制

How to turn on PLE:

如何打开PLE：

sudo rmmod kvm_intel
sudo modprobe kvm_intel 
cat /sys/module/kvm_intel/parameters/ple*复制

References
[1] https://stackoverflow.com/questions/12111954/context-switches-much-slower-in-new-linux-kernels
[2] https://www.google.com/patents/US9021497
[3] https://surriel.com/system/files/riel_t_1620_kvm_performance.pdf
[4] https://haypo.github.io/intel-cpus.html

参考资料
[1] https://stackoverflow.com/questions/12111954/context-switches-much-slower-in-new-linux-kernels
[2] https://www.google.com/patents/US9021497
[3] https://surriel.com/system/files/riel_t_1620_kvm_performance.pdf
[4] https://haypo.github.io/intel-cpus.html

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IDLE=POLL means when vCPU is idle CPU will execute No Op instruction like spin-lock does. This will trigger PLE if PLE is turned on.

IDLE=POLL表示当vCPU空闲时，CPU将像自旋锁一样执行No Op指令。 如果PLE打开，这将触发PLE。

Also see this slides for more details about P-States.

另请参阅此幻灯片以获取有关P状态的更多详细信息。

翻译自: https://www.systutorials.com/how-to-tune-systems-to-achieve-high-performance-in-virtualization-circumstances/

虚拟机虚拟化cpu性能