Frank van der Linden wrote:
> Maybe another simple thing to try is 'don't touch text pages, unless
> the data pages fall below a certain threshold'. This would
> be easy to do (it's all in lines 451-478 in uvm_pdaemon.c).
> 
> Lastly, I believe that another problem was that shared libraries
> are treated the same as 'normal' data files. Not sure what to
> do there, maybe a heuristic that prefers keeps r-x mapped pages?

I'd probably preferred if the buffer cache would not touch text&data
pages at all. In other words, that buffer cache would only use
free, otherwise unused memory. It seems highly suboptimal for the page
scanner to kick processes' data/text pages out of memory just to make
more room for i/o buffers.

I think there should be some minimal value of memory dedicated to
buffer cache (i.e. what BUFCACHE/BUFPAGES does) and more memory
would only be used if it's otherwise _unused at all_.
Perhaps this might be an option, but such behaviour should be default IMHO.

Jaromir
-- 
Jaromir Dolecek <jdolecek@NetBSD.org>      http://www.ics.muni.cz/~dolecek/
NetBSD - just plain best OS! -=<>=- Got spare MCA cards or docs? Hand me them!