How to count EPC paging, EPC hits and EPC misses?

chi__kai · ‎02-11-2021

Hi,

I am looking for a way to count EPC hits and misses, and EPC paging.

For EPC paging I thought of counting the invocations of the EWB instruction. For that I placed a counter in:

static void sgx_evict_page(struct sgx_encl_page *entry,
			   struct sgx_encl *encl)

Every invocation would equal to 4kB of data. Is that correct?

I actually tried it out and for an enclave that processed some data in 30s it showed me 6000MB of EPC paging. Could that really be the number?

I struggle to find a way to count EPC hits and misses. Is there a way to detect an EPC access?

Best,

Kajetan

JananiC_Intel · ‎02-12-2021

Hi,

Thanks for posting in Intel forums.

Could you share your platform details?

Regards,

Janani Chandran

chi__kai · ‎02-12-2021

I'm running Ubuntu 18.04.5 with kernel 5.3.0 on Intel Core i7-8565U CPU and SGX driver v2.11

JananiC_Intel · ‎02-18-2021

Hi,

Sorry for the delay .We are checking with the concerned team. We will get back to you shortly.

Regards,

Janani Chandran