On Tue, 2020-06-02 at 09:08 +0000, Wei Liu wrote: > On Fri, May 01, 2020 at 02:53:08PM +0100, Hongyan Xia wrote:
[...] > Not sure about hiding EPT. I will leave this question to Jan and > Andrew... Quick update on performance numbers. I have seen noticeable performance drop if we need to map and unmap EPT. This translates to up to 10% degredation in networking and database applications. With EPT always mapped (not considering it as secrets), I have not seen any noticeable performance drop in any real-world applications. The only performance drop is from a micro-benchmark that programs HPET in a tight loop (abusing MMIO page table walks), and the worst case is around 10% to 15%. Note that all above results are based on the mapcache rewrite patch 4058e92ce21627731c49b588a95809dc0affd83a.1581015491.git.hongy...@amazon.com to fix the mapcache lock contention first. Hongyan
