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-.-'s avatar

> P550 executes more instructions to finish the same work, and I’m not sure why.

If you're using sha256sum without compiling it yourself, chances are the RISC-V binaries are compiled without bitmanip instructions, so it's likely having to use less efficient sequences for stuff like bit rotates.

Which I think is a major issue with RISC-V in general - all the fragmentation means that Linux distributions target the lowest common denominator. RISC-V's attempts with profiles is nice, but distros still compile for x86-64v1 despite v2 being standard on x86 CPUs for the past ~15 years.

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Fredrik Tolf's avatar

Any idea how the P550 or C910 compare to the A53 or A55 area- or power-wise? Since they seem roughly comparable in performance, it would be interesting to know how they compare in such metrics.

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