bartekb - 7:53 am on Apr 28, 2012 (gmt 0)
I attached graphs from munin. You can see big change in memory and in apache processes counter when I turn on KeepAlive On instead of KeepAlive off.
Exceed 12GB server memory
I upgraded from PHP 5.4.0 to PHP 5.4.1, but there was no change (today hop).