Nginx1.0.15 stable, cut off a 16k js static file into 2.03k

nginx version 1.0.15 stable
im running into a problem the a 16k static file was cut off into a 2.03k
incomplete file occasionally, 7 times of 10 will get the incomplete
i use the nginx server for pure static file serving
sendfile on,
tcp_nopush on,
tcp_nodelay on,
keepalive timeout 0,
gzip off
open_file_cache on
using epoll
no other configurations, what could be the problem? client body size?

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