Now that I’m correctly loading the extension (zend_extension_ts), eAccelerator is running smoothly.

I found something interesting in the event log yesterday:

PHP Warning:  [eAccelerator] This build of "eAccelerator" was compiled for PHP version 5.2.9. Rebuild it for your PHP version (5.2.9-2) or download precompiled binaries.

Now that error message makes perfect sense. The reason I didn’t see it the first time around is that PHP logged two messages separately at the same time. If I was reading a flat file log, I would’ve noticed it immediately.