Re: native Oracle-port on Linux -- what would it take?

Nix wrote:
...........
> I'll say! My Linux box slowed down drastically after 2.0.29, because the
> buffer caching code was rewritten. Before the change, the buffer cache on my
> 8Mb system was around 200-500Kb; now, it's 2.5Mb or higher. This means that
> with the kernel X running too, I've got less than 800Kb free for other
> processes. It really would be *much* faster if I could set a forced maximum
> size or something; I've looked at the code to try to do that but it's such
> a tangle I hardly know where to start. :(

Try something like this:

echo "128 256 1024" > /proc/sys/vm/freepages

It may not be exactly what you want but it helps. Experiment with the values a little bit and see if it makes a difference. The above was optimal for my system with 48MB of RAM and 48MB of swap partition. I think I saw it explained in some linux* newsgroups in more details, try to find it with Dejanews.

As far as I understood, the buffer caching algorithm rewrite you mentioned didn't really make Linux slower: its defaults only made the performance curve flatter which is good.

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     Vlad Petersen       |     <vladimip at uniserve dot com>
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