Linux Kernel Getting io_uring To Deliver Fast & Efficient I/O

[rene]

This makes spectre performance loses look minor.

Turns out the Spectre mitigation is mostly useless anyway :-/ https://arxiv.org/pdf/1902.05178.pdf

[oiaohm]

Turns out the Spectre mitigation is mostly useless anyway :-/ https://arxiv.org/pdf/1902.05178.pdf

Its not only that the mitigation can be useless and the best mitigation is replace the cpu with one without the defect. If you read white papers like that you will notice these cpu bugs fairly much rip down the barrier between ring 0 and ring 3 so making microkernel protections useless as well in this white paper it partly covered by the javascript vm example. So you are paying speed for absolutely no gain in a lot of cases with Microkernel because it has to implement all the same hardware protections Linux kernel and other monolithic have to as well as taking the extra over head. Please note Linux is not a pure monolithic that Linux can use Microkernels like parts where it makes security and performance sense this started with the user mode helpers.

If you are going to be insecure either way you might as well be fast. This is the major problem with microkernel it really does not have a fast option.