Bridging the Architecture Divide: How Hardware Limits Wasm, and How We Can Do Better
Talkat WasmCon 2023 · on Thursday, 2023-09-07· at 16:15· Grand Ballroom F, Hyatt Regency Bellevue, 900 Bellevue Way NE·
summary
Wasm runtimes gain concrete wins: Segway: reuses x86 FS/GS segmentation to make heap-base addressing, freeing a register, cutting code size and lowering compile time and shaving about 25% off the “wasm tax” versus native (already shipping in Wasmer). Color Guard: uses MPK to color pages and pack sandboxes, increasing instance density from ~20K to ~250K (~12×). A proposed HFI design does region checks in parallel with TLB lookups, enabling near-zero setup/teardown, zero-cost bounds checks, Spectre safety, and unlimited scaling.
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chapters (8)
- 0:00WebAssembly limitations
- 1:04Hardware optimization techniques
- 9:03Memory protection challenges
- 12:14Memory protection keys
- 15:23Fault isolation design goals
- 25:13Performance benefits of fault isolation
- 26:57How to get involved with these technologies
- 36:02Q&A
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