First:
I saw one possible problem straight off:
you compiled Apache with
-D USE_FCNTL_SERIALIZED_ACCEPT
To get the benefit of the wake-one kernel patches,
you have to compile instead with
-DSINGLE_LISTEN_UNSERIALIZED_ACCEPT
As far as I know, the way you compiled Apache,
the kernel is still waking up all processes
("the thundering herd") when it should only
be waking up one. This hurts SMP performance.
Please have a look at the section "Suggestions
for future benchmarks" in
http://www.kegel.com/mindcraft_redux.html
Second: I see your load generating program uses
multiple processes, and you mention that it can't
generate enough load to really hit an SMP server hard.
Perhaps you should try a different load client, e.g.
http://www.acme.com/software/http_load/ It
might be able to load your server down more effectively.
Thanks,
Dan
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