I have another patch set available. #6
http://apollo.backplane.com/FreeBSD4/
(I'm working on a -current version of the patch. It takes a bit of time,
I have to do it by hand).
The previous patchset tried to pageout too much, which greatly effects
load on heavily loaded machines. I wound up having to put the
maxlaunder code back in but with some mods to deal with the opposite
situation that Yahoo faces with all their dirty MAP_NOSYNC pages. News
systems tend to have a huge number of recycleable 'clean' pages while
Yahoo's machines tend to have a huge number of 'dirty' pages.
I would first try the patch without any additional hacks, except perhaps
for some tuning (via sysctl) of vm.v_cache_min and vm.max_launder. I
would suggest raising vm.v_cache_min (don't raise it past vm.v_cache_max
though or also raise vm.v_cache_max), and perhaps dropping vm.max_launder
from 32 to 16.
-Matt
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