Messages in this thread | | | From | Al Boldi <> | Subject | [RFC] kswapd: Kernel Swapper performance | Date | Sat, 28 Oct 2006 20:31:17 +0300 |
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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
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