* Perry E. Metzger <perry@wasabisystems.com> [020619 14:34] wrote:
> 
> Martin Weber <Ephaeton@gmx.net> writes:
> > Really, I have to agree with Wojciech, a hint or howto pointing out all
> > the knobs, as well as reasonable values for those, would be rather helpful
> > for the gros of the NetBSD users imho. That is not to say that the defaults
> > are unusable, just saying that it would make research on how to tune your
> > system to your needs easier.
> 
> There should be a man page for this. I'll get one done.
> 
> In general, though, UBC is pretty easy to tune. If you're spending all
> your time paging in executables, raise execmin until you feel your
> performance is happy. If you are paging anons in constantly, raise
> anonmin until that one is happy. The goal is to get your paging rate
> down as far as you can go without sacrificing the benefits of the
> larger buffer cache. It depends a lot on your system load and mix. On
> a system that does mostly giant builds and has gigs of memory, making
> 75% of memory or even more into buffer cache is a quite reasonable
> idea. On a system with 32M, tuning is necessarily different.
> 
> Usually I advise people on small memory machines to just kick up the
> exec and anon parameters bit by bit until they feel like they have
> interactive performance on par with what they want.

I understand code/patches are much more desireable than pontification
on the lists and I apologize in advance... :)

I was wondering if perhaps some hueristics could be applied based on
pageout/pagein ratios between the exec/anon pools to automagically
tune them within a time frame.

-- 
-Alfred Perlstein [alfred@freebsd.org]