https://jasper-aa64.github.io/tags/prefetch/Recent content in Prefetch on JasperHugoen-usTue, 20 Oct 2026 00:00:00 +0000https://jasper-aa64.github.io/posts/low-latency-cache-case-study/Tue, 20 Oct 2026 00:00:00 +0000https://jasper-aa64.github.io/posts/low-latency-cache-case-study/One tick touches 140 cache lines, and most of the time goes into waiting for them. None of the four steps changes the computation; they change when data arrives, where it lands and who holds it: put the misses in flight together, ask for the next batch early, hand back lines that are dead after one read, read one line less across the handoff, and leave the lines the other core will read in L3.https://jasper-aa64.github.io/posts/prefetch-warmup-double-buffer/Thu, 15 Oct 2026 00:00:00 +0000https://jasper-aa64.github.io/posts/prefetch-warmup-double-buffer/There are three ways to get data into cache ahead of time, each with a precondition: prefetching needs you to know the address before the hardware does, warming has to happen on the core that reads the data, and double buffering needs a guarantee that the writer never returns to a copy a reader hasn’t finished.