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When Raspbian (the default OS for the Pi) compiles its kernel, it targets broad compatibility, specifically, it wants to support 32-bit ARMv7 userspace applications running on a 64-bit kernel. Supporting 32-bit applications on a 64-bit kernel means the kernel has to accommodate two different address space models simultaneously, and using 39-bit VA reduces TLB pressure on hardware that wasn’t designed for massive address spaces. It’s a sensible default for a general-purpose embedded OS, but it comes at a cost for cloud-native software like gVisor.。业内人士推荐黑料作为进阶阅读
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HACL*: A Verified Modern Cryptographic Library.
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