What is strnlen in the Linux kernel ?

strnlen safely measures string length up to n bytes, stopping at null—avoids overflows in kernel space.

How much faster is RISC-V strnlen in Linux 7.1?

Up to 427% on optimized paths; 100-200% generic. strchr/strrchr add 7-8%.

Will RISC-V optimizations make Linux faster overall?

Yes, incrementally—strings are ubiquitous; compounds with future vector work.

Linux 7.1's RISC-V strnlen Overhaul Delivers 427% Speed Spike

Deep in the Linux kernel's guts, a simple string-length function just got turbocharged for RISC-V—427% faster. It's a win for the open ISA challenging ARM and x86 dominance.

theAIcatchup Apr 10, 2026 3 min read

RISC-V assembly code snippet optimizing strnlen function for Linux kernel

⚡ Key Takeaways

Feng Jiang's RISC-V strnlen asm yields 427% speedups in Linux 7.1, with strchr/strrchr bonuses. 𝕏
Boosts signal RISC-V kernel maturity, aiding server/edge adoption amid ARM/x86 rivalry. 𝕏
China's KylinOS drives upstream wins, predicting 20-30% aggregate kernel gains soon. 𝕏

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#Linux 7.1 #Linux kernel #RISC-V #assembly performance #kernel assembly #kernel optimization #kernel performance #performance-tuning #strnlen assembly #strnlen optimization

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Originally reported by Phoronix

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