Prefetch for Intel Core 2 Duo?

From an Intel reference document on Intel 64 and IA-32 Architectures, check out page 163 and 77: Pentium 4 and Intel Xeon processors based on Intel NetBurst microarchitecture introduced hardware prefetching in addition to software prefetching. The hardware prefetcher operates transparently to fetch data and instruction streams from memory without requiring programmer intervention. Subsequent microarchitectures continue to improve and add features to the hardware prefetching mechanisms.

Earlier implementations of hardware prefetching mechanisms focus on prefetching data and instruction from memory to L2; more recent implementations provide additional features to prefetch data from L2 to L1. In Intel NetBurst microarchitecture, the hardware prefetcher can track 8 independent streams The Pentium M processor also provides a hardware prefetcher for data. It can track 12 separate streams in the forward direction and 4 streams in the backward direction.

The processor’s PREFETCHNTA instruction also fetches 64-bytes into the firstlevel data cache without polluting the second-level cache Intel Core Solo and Intel Core Duo processors provide more advanced hardware prefetchers for data than Pentium M processors. Key differences are summarized in Table 2-10.

From an Intel reference document on Intel 64 and IA-32 Architectures, check out page 163 and 77: Pentium 4 and Intel Xeon processors based on Intel NetBurst microarchitecture introduced hardware prefetching in addition to software prefetching. The hardware prefetcher operates transparently to fetch data and instruction streams from memory without requiring programmer intervention. Subsequent microarchitectures continue to improve and add features to the hardware prefetching mechanisms.

Earlier implementations of hardware prefetching mechanisms focus on prefetching data and instruction from memory to L2; more recent implementations provide additional features to prefetch data from L2 to L1. In Intel NetBurst microarchitecture, the hardware prefetcher can track 8 independent streams. The Pentium M processor also provides a hardware prefetcher for data.It can track 12 separate streams in the forward direction and 4 streams in the backward direction.

The processor’s PREFETCHNTA instruction also fetches 64-bytes into the firstlevel data cache without polluting the second-level cache. Intel Core Solo and Intel Core Duo processors provide more advanced hardware prefetchers for data than Pentium M processors. Key differences are summarized in Table 2-10.

I don't know whether it might be an issue with your code, but consider that the cache line size (which determines the stride size for use with prefetch instructions) may vary between different processors. Therefore, if you use code which is optimised under the assumption of a different cache line size on a CPU where this assumption isn't met, it's bound to deteriorate performance. This question here asked how to determine prefetch cache line size.

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