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From: Jesse Barnes <jbarnes@virtuousgeek.org> Date: Fri, 16 Dec 2005 16:41:49 -0800 > Note that under contention prefetching with a write bias can cause a lot > more cache line bouncing than a regular load into shared state (assuming > you do a load and test before you try the CAS). If there is some test guarding the CAS, yes. But if there isn't, for things like atomic increment and decrement, where the CAS is unconditional, you'll always eat the two bus transactions without the prefetch for write. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||
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