On Tue, 11 Jan 2022 09:43:35 -0600, Dave Hansen <dave.hansen@xxxxxxxxx>
wrote:
On 1/11/22 06:20, Haitao Huang wrote:
If the system has a ton of RAM but limited EPC, I think it makes sense
to allow more EPC swapping, can we do min(0.5*RAM, 2*EPC)?
I suppose if the system is used for heavy enclave load, user would be
willing to at least use half of RAM.
If I have 100GB of RAM and 100MB of EPC, can I really *meaningfully* run
50GB of enclaves? In that case, if everything was swapped out evenly, I
would only have a 499/500 chance that a given page reference would fault.
The formula will cap swapping at 2*EPC so only 200MB swapped out. So the
miss is at most 1/3.
The original hard coded cap 1.5*EPC may still consume too much RAM if
RAM<1.5*EPC.
This isn't about a "heavy enclave load". If there is *that* much
swapped-out enclave memory, will an enclave even make meaningful forward
progress?
