Jeremy Fitzhardinge wrote: > Tim Chen wrote: > >> I also hope that the performance can be recovered as this option could >> enabled in distributions' kernels in future. >> > > Yes, the intent is that running a CONFIG_PARAVIRT kernel on native > hardware will have negligible performance hit compared to running a > non-paravirt kernel. > We can validate that claim entirely. The way we are proceeding, the native code will be inlined or direct called as much as possible. With the VMI-Linux code we had earlier, this mostly created <3% overhead for microbenchmarks (and in some cases, we actually won over the unmodified native code). For macro-benchmarks, with real-world workloads, this reduced to immeasurable noise, never off by more than +/- 0.5% IIRC. I believe all of this is totally achievable. We have the technology. We can rebuild it. Zach
