top | item 34251055

(no title)

gabcoh | 3 years ago

The comparison with QEMU is with KVM disabled, right? Assuming this is true, how does it compare with KVM enabled?

discuss

monocasa|3 years ago

I think this is a user mode emulator, so qemu with kvm isn't a great comparison.

jart|3 years ago

Blink is primarily a user mode emulator, but it does support real mode BIOS programs. It can even bootstrap Cosmopolitan Libc bare metal programs into long mode. Here's a video of Blink doing just that. https://storage.googleapis.com/justine/sectorlisp2/sectorlis...

gabcoh|3 years ago

Is this true? Why can’t qemu use kvm for user mode emulation?

fwsgonzo|3 years ago

KVM allows you to run guests directly on the CPU and has native performance

monocasa|3 years ago

Well, not quite 'native'. TLB refills are 4x to 5x as expensive, and anything that needs a context switch tends to be at a minimum twice as expensive, and it's common to balloon even farther from there.