Messages in this thread | | | From | Daniel Phillips <> | Subject | Re: VM working much better in 2.4.8 than before | Date | Tue, 14 Aug 2001 15:03:51 +0200 |
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On August 13, 2001 05:52 pm, Rik van Riel wrote: > On Mon, 13 Aug 2001, Alan Cox wrote: > > > Yes, those would be the expected effects of use-once, in fact it was > > > "morning after updatedb" question that got me started on it. > > > > updatedb is also absolutely fine if you just work with the existing VM > > and up the inode pressure a little. I'm still very unconvinced by > > use-once. > > Use-once has a number of theoretical disadvantages too: > > 1) newly read in pages are evicted earlier, this means > readahead pages will either evict each other or the > amount of readahead done might need to be shrunk > -- the current readahead code is not prepared for this, > use-once could lead to more disk seeks being done
Have you actually seen this happening?
> 2) since we add new pages to the inactive list, VM > balancing is faced with a really strange situation ;) > > Yes, these things are solvable, but not without redesigning > major parts of the VM balancing to do things which have never > been done before. I'm not sure 2.4 is the time to do that.
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