Hi,
turck-mmcache is packaged for Debian and I'm using it here for Moodle without any noted issues. You have to be using PHP4 not PHP5 though. There is a forked version for PHP5 but it's still in development and not yet in Debian stable (or even testing?) as far as I know.
http://eaccelerator.net/HomeUk
Gavin
Hardware and performance
Calculating the Needed Size and Speed of a Server
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