Messages in this thread | | | Date | Sun, 4 Nov 2001 09:18:02 -0800 (PST) | From | Linus Torvalds <> | Subject | Re: VM: qsbench numbers |
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On Sun, 4 Nov 2001, Lorenzo Allegrucci wrote: > > I begin with the last Linus' kernel, three runs and kswapd CPU > time appended.
It's interesting how your numbers decrease with more swap-space. That, together with the fact that the "more swap space" case also degrades the second time around seems to imply that we leave swap-cache pages around after they aren't used.
Does "free" after a run has completed imply that there's still lots of swap used? We _should_ have gotten rid of it at "free_swap_and_cache()" time, but if we missed it..
What happens if you make the "vm_swap_full()" define in <linux/swap.h> be unconditionally defined to "1"? That should make us be more aggressive about freeing those swap-cache pages, and it would be interesting to see if it also stabilizes your numbers.
Linus
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