Messages in this thread | | | Subject | Re: [PATCH v2 1/2] x86/sgx: Add accounting for tracking overcommit | Date | Tue, 11 Jan 2022 10:33:26 -0600 | From | "Haitao Huang" <> |
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On Tue, 11 Jan 2022 09:43:35 -0600, Dave Hansen <dave.hansen@intel.com> 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?
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