HDD slow down in heavy load

[k simon]

Hi, List,
   I observed sometimes DragonflyBSD do much better than FB in heavy 
load , eg. squid or zabbix's postgresql database.
   The difference may related to DFBSD have enhanced CAM DA driver to 
separate read and write streams, allowing concurrent write completion in 
the face of many stalled read requests.
   It's released within DFBSD V2.10 at 2011:
http://leaf.dragonflybsd.org/mailarchive/commits/2011-04/msg00062.html
http://leaf.dragonflybsd.org/mailarchive/commits/2011-04/msg00061.html
   I guess I'm alone for notice it.



Regards
Simon