[RFC] kswapd: Kernel Swapper performance
From: Al Boldi
Date: Sat Oct 28 2006 - 13:29:08 EST
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
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/...).
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