After removing APC (alternative php cache), I noticed that there are less pagination access and less dirty pages but in the same time:High idle CPUVery low CPU load (relatively to the time before removing APC)If I am not mistaken CPU Idle can be a bad thing.So I checked the interruptible sleeping process/threads.while true; do date; ps auxf | awk '{if($8==D) print $0;}'; sleep 1; doneI noticed that there is no waiting processes.Do you think that this idle can be caused by something else?Removing APC may be the cause to more disk access, because there are no php opcodes(generated by APC) and saved to the memory.
High Idle CPU / Low CPU Load average
process;php;cpu;io