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Linux: Debating Swap-Prefetch

May 07, 2007, 10:30 (0 Talkback[s])

"Ingo Molnar reviewed Con Kolivas's swap-prefetching patches suggesting that they were ready for inclusion in the mainline kernel, 'I've reviewed it once again and in the !CONFIG_SWAP_PREFETCH case it's a clear NOP, while in the CONFIG_SWAP_PREFETCH=y case all the feedback i've seen so far was positive. Time to have this upstream and time for a desktop-oriented distro to pick it up.' He went on to describe swap prefetch, 'to the desktop user this is a speculative performance feature that he is willing to potentially waste CPU and IO capacity, in expectation of better performance. On the conceptual level it is _precisely the same thing as regular file readahead_. (with the difference that to me swapahead seems to be quite a bit more intelligent than our current file readahead logic...)'"

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