Mike, I was native compiling on A72 (64 bit) using libgmp version 10.2. Thanks, -vijay
On Feb 7, 2017 7:21 PM, "Mike Mohr" <akih...@gmail.com> wrote: > Licensing issues are indeed thorny. Why can't openssl perform a dynamic > link? The soversion should handle any ABI issues introduced in later > versions of GMP. > > Are you cross compiling GMP for your use on a target device? If so, you'll > need to ensure that the MPN_PATH is set appropriately. If you don't do so, > you'll get the generic c code instead of optimized assembly routines. The > performance difference can be dramatic, potentially several orders of > magnitude. I had to deal with this myself when cross compiling GMP for > Android. > > On Feb 7, 2017 4:51 PM, "Vijay Chander" <vijay.chan...@gmail.com> wrote: > > Yes. Already took Andy's word from his previous replies for precisely this > reason. > > GMP exercise was easy enough to get it out of the way. > > Thanks, > Vijay > > On Feb 7, 2017 4:46 PM, "Jakob Bohm" <jb-open...@wisemo.com> wrote: > >> OpenSSL also has a lot of handwritten assembly language for ARM, >> x86 etc. Most of it written by Andy Polyakov. >> >> His response about what can and cannot be done on various ARM CPU >> models is most probably a result of this work. >> >> Also, OpenSSL has a more permissive license than the GMP, so using >> GMP in OpenSSL would cause problems for many OpenSSL using >> applications. >> >> On 08/02/2017 00:31, Mike Mohr wrote: >> >>> Have you considered using GMP as a big integer backed for openssl? It >>> has support for several arm variants using handwritten assembly code >>> and the developers go to great lengths to find optimize runtime on all >>> supported platforms. >>> >>> On Feb 7, 2017 2:26 PM, "Vijay Chander" <vijay.chan...@gmail.com >>> <mailto:vijay.chan...@gmail.com>> wrote: >>> >>> Andy, >>> 1:2.5 is pretty in my opinion for ARM ! >>> >>> We will check out Mongoose. >>> >>> Hmm - will try to get to the bottom of those cache misses (at a >>> lower priority). >>> >>> Thanks, >>> -vijay >>> >>> >>> On Tue, Feb 7, 2017 at 11:07 AM, Andy Polyakov <ap...@openssl.org >>> <mailto:ap...@openssl.org>> wrote: >>> >>> > A72 is running 1GHz compared to x86 at 2.1Ghz. So that should >>> hopefully >>> > get down to -1:5. >>> >>> And Mongoose will take you to ~1:2.5 (scaled to same frequency >>> that is). >>> Which I'd say is a fair result. Well, still could have been a bit >>> better, but it's not unreasonable given ISA differences. Keep >>> in mind >>> that presented x86_64 result is for code utilizing >>> Intel-specific code >>> extensions. >>> >>> > There is no L3 cache on the A72 eval board and performance >>> counters do >>> > show 9x more DRAM accesses for ARM compared to x86. >>> >>> This is unexpected, because it takes *less* references to >>> memory to >>> perform it on ARMv8. Because it has larger register bank. And >>> cache >>> requirement is not that high for L3 to kick in... But at any >>> case memory >>> is not bottleneck here... >>> >>> >> >> -- >> Jakob Bohm, CIO, partner, WiseMo A/S. https://www.wisemo.com >> Transformervej 29, 2860 Soborg, Denmark. direct: +45 31 13 16 10 <tel: >> +4531131610> >> This message is only for its intended recipient, delete if misaddressed. >> WiseMo - Remote Service Management for PCs, Phones and Embedded >> >> >> Enjoy >> >> Jakob >> -- >> Jakob Bohm, CIO, Partner, WiseMo A/S. https://www.wisemo.com >> Transformervej 29, 2860 Søborg, Denmark. Direct +45 31 13 16 10 >> This public discussion message is non-binding and may contain errors. >> WiseMo - Remote Service Management for PCs, Phones and Embedded >> -- >> openssl-users mailing list >> To unsubscribe: https://mta.openssl.org/mailman/listinfo/openssl-users >> > > -- > openssl-users mailing list > To unsubscribe: https://mta.openssl.org/mailman/listinfo/openssl-users > > > > -- > openssl-users mailing list > To unsubscribe: https://mta.openssl.org/mailman/listinfo/openssl-users > >
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