Firecracker MicroVMs

Re:Firecracker MicroVMs by jsolson on Monday October 18, 2021 @07:37PM (#28913228)

Firecracker relies on KVM in the Linux kernel which relies on VT-x or similar. Offering VT-x inside a VM that's already using VT-x is called nested virtualization. EC2 VMs do not support nested virtualization, while others do.

That said, it works fine on EC2 Bare Metal instances.

(n.b., I work on the virtualization stack on Google Compute Engine)

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Re:Firecracker MicroVMs by bushbaba on Monday October 18, 2021 @08:08PM (#28913455)

Wouldn’t you want to run firecracker on bare metal anyways. Nested VMs come with a decent perf hit.

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Re:Firecracker MicroVMs by cutemonster on Wednesday October 20, 2021 @05:21PM (#28936826)

Thanks @jsolson for explaining

@bushbaba I wonder how large the percentage hit could be, if it's like 1% or 10%, if you happen to know

And how that percentage hit compares with gvisor performance wise

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