In a continued effort to keep this site online all the time I’m looking for some help in tuning apache2.  Earlier today we ran into some serious performance issues based on what I had it tuned to, which caused 3/4 of the total swap to be used.  NOT a good idea.

In the meantime I have turned things down a bit in the prefork MPM section, but I’m wondering what other tips the community has.  What values do you suggest in prefork MPM for performance tuning?

The box is a quad-core xen vps with 512M.  I have 5,000+ unique visitors a day on this site in addition to the dozen other blogs hosted (none near as popular).  What can I do to keep up with the traffic, yet keep the load down on the machine for performance?

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