On Thu Jan 29, 2026 at 9:31 AM UTC, 山卡洛 wrote: > Which is the reason for the single-processor kernel being shipped? I am not > sure about the history, but I suspect that single-core processors were not > commercially available since at least 10-15 years.
Hi, While it's true that single core AMD64 + ARM64 processors are rare, there are a couple of good reasons to have non-SMP kernels. One is for virtualization use, VMD only supports single cores. And even aside from VMD, single vCPU VPSs are very common. The other is that there are a number of bugs related to SMP where you may be able to have a running system on non-SMP kernels. It can be helpful for debugging, if nothing else. -Henrich
