On 9/22/22 12:08, Tejun Heo wrote: > Can you please give more concrete examples? I'd love to hear how the SGX EPC > memory is typically used in what amounts and what's the performance > implications when they get reclaimed and so on. ie. Please describe a > realistic usage scenario of contention with sufficient details on how the > system is set up, what the applications are using the SGX EPC memory for and > how much, how the contention on memory affects the users and so on. One wrinkle is that the apps that use SGX EPC memory are *normal* apps. There are frameworks that some folks are very excited about that allow you to run mostly unmodified app stacks inside SGX. For example: https://github.com/gramineproject/graphene In fact, Gramine users are the troublesome ones for overcommit. Most explicitly-written SGX applications are quite austere in their SGX memory use; they're probably never going to see overcommit. These Gramine-wrapped apps are (relative) pigs. They've been the ones finding bugs in the existing SGX overcommit code. So, where does all the SGX memory go? It's the usual suspects: memcached and redis. ;)
