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Date: Sat, 28 Oct 2006 20:31:17 +0300 From: Al Boldi <a1426z@...ab.com> To: linux-kernel@...r.kernel.org Subject: [RFC] kswapd: Kernel Swapper performance One thing that has improved in 2.6, wrt 2.4, is swapper performance. And the difference isn't small either: ~5 fold increase in swapin performance. But swapin performance still lags swapout performance by 50%, which is a bit odd, considering swapin to be a read from disk, usually faster, and swapout to be a write to disk, usually slower. Now, this slowdown could be explained by additional seek action, caused by different apps paging-in at different times with different locations on swap. Yet, even a single app paging-out consecutive pages, and paging-in the same pages in one go, exhibits this upside-down swapout/swapin performance ratio. Improving this ratio could possibly yield a dramatic improvement in system performance under memory load (think tmpfs/swsusp/...). Thanks! -- Al - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.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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