[Dragoran]

Here is a thread I opened last year, but it's in german.
http://forum.ubuntuusers.de/topic/55202/

no problem I am from austria
seems that you are doing the benchmarks while running apps in the background which uses disk I/O (is yacy the only one) ?
what does

cat /sys/block/sda/device/queue_depth

show? (if its not 0 (should be 31 by default) it means that ncq is enabled and works)