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