linux - 隔离 cpu 内核(物理的还是逻辑的？)

Question

我认为内核参数“isolcpus”接受物理核心 ID 是否正确？因此，如果我有 4 个物理内核，并启用了超线程，总共有 8 个内核，那么我只能在 isolcpus 参数中指定 cpu 内核 1..3(内核 0 用于操作系统)？

谢谢。

Answer 1

红帽大师 Daniel Macpherson在 a Red Hat community discussion 中说:

So you might need to restrict the kernel from accessing the CPUs you have pinned to the instance. For example, let's say I have an 8 core CPU with dual hyper-threading, which results in 16 vcpus. I want to use core 0 for my OpenStack services and cores 1-7 for instances. I'd need to tell the kernel to leave those cores alone. This means I'd need to tell the kernel to leave alone vcpus 1-7 and 9-15:

$ sudo grubby --update-kernel=ALL --args="isolcpus=1,2,3,4,5,6,7,9,10,11,12,13,14,15"
$ sudo grub2-install /dev/sda
$ sudo reboot

据此，您指定 logical CPU cores isolcpus 内核参数。