Nginx 1.2.7 + Apache2 2.2.24 on Freebsd 9.1 speedtest mini hosting upload speed problem

[ans34]

I have Nginx 1.2.7 + Apache2 2.2.24. Nginx config is default, no buffer
sizes changed etc. I moved my speedtest mini host there and got problem with
upload speed. Speedtest folder is on RAMdisk, so there is no problems with
access speed and download speed is 300+ Mbit/s. But upload was anly 40-50
Mbit/s After setting sendfile off; in nginx.conf upload speed increased to
80-120 Mbit/s During upload test  in top io mode nginx show 100%
VCSW IVCSW READ WRITE FAULT TOTAL PERCENT COMMAND
4839 0 0 16 0 16 100.00% nginx

and gstat show writing operations on hdd

Setting client_body_temp_path to ramdisk folder and changing client_body*
variables to not default values make upload speed slower
Is there anything onther to change to make uplaod speed much faster

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,244483,244483#msg-244483