Re: [RFC PATCH v2 0/7] x86/idle: add halt poll support

Andi Kleen
2017-08-29T13:03:35Z

Yang Zhang <yang.zhang.wz@gmail.com> writes:

> Some latency-intensive workload will see obviously performance
> drop when running inside VM. The main reason is that the overhead
> is amplified when running inside VM. The most cost i have seen is
> inside idle path.

You could test with https://lkml.org/lkml/2017/7/9/204
which optimizes these idle paths with a fast path.

If that works it would be a far better solution than
explicit tunables and basically giving up by polling.

-Andi