We've been running on MW 1.4 for longer than we should have been, and tried upgrading today to 1.6.7. We're running a Squid server on one machine, and PHP 4.4.2 with Apache 2.0.46 with eAccelerator installed on another, and then a third server for mySQL 4.1, all machines are Linux.
I did a db dump, imported it into a new database, went through config/index.php to convert the new database and pointed Apache to the new source directory. The load on the Apache server went through the roof and won't stay down. I tried restarting Apache, rebooting the server, any way to bring the load down to 0, then started Apache and Squid back up, and the load would go through the roof again - and it stays there. The database shows a lot of open & sleeping connections, but none are locked. Switching back to 1.4 seems to solve the load problem.
Any ideas? Did I miss something during the upgrade process?
Travis