I've just taken in several of the O.S. discussions, detecting a difinitive bias in favor of linux over windows... but nowhere in the discussions did I hear mentioned what O.S. (and "flavor, assuming linux) moodle.org hosts from?
Linux kernel as can be seen from http://uptime.netcraft.com/up/graph?site=moodle.org . It does not appear to say anything about the flavour.
Apparently it is RH Enterprise 5.5, except that some of the packages like PHP have been rebuilt with different compile options.
this was just the info I needed.
And thanks for suggesting phoronix, good reading!
Hardware specs are at: http://moodle.org/mod/forum/discuss.php?d=113921#p529176
Both servers are running Red Hat Enterprise Linux 5.5
We roll our own RPM's here at Moodle HQ to keep up to date with the latest apache, php, mysql and a few other dependancy libraries.