[Libevent-users] Re: libevent http and lost requests

[about bus <aboutbus@xxxxxxxxx>]

I've added some debug output in libevent functions, added "fd" (file descriptor) in every output message.
messages from libevent - [warn]
messages from my http server - v[3]
Also I've changed timeout in nginx config from 75 to 30, it does not increase or decrease timeouts count.
I've got about 0.1% timeout errors independently from timeout value.

Log output for one of timeouted requests:

2011.08.12 21:30:02 [warn] ===    evhttp_get_request_connection: fd: 142 new request from 127.0.0.1:49242
2011.08.12 21:30:32 [warn] ===    event_active: 0x802a84480 (fd: 142), res 2, callback 0x8007970f0
2011.08.12 21:30:32 [warn] ===    evhttp_read_cb: fd: 142 len: 448: data: GET /query/xxx/yyy/ HTTP/1.0 <-- other headers --> \r\n\r\n
2011.08.12 21:30:32 [warn] ===    evhttp_read_firstline: fd: 142
2011.08.12 21:30:32 [warn] ===    evhttp_read_header: fd: 142
2011.08.12 21:30:32 [warn] ===    evhttp_get_body: fd: 142
2011.08.12 21:30:32 [warn] ===    evhttp_handle_request: fd: 142
2011.08.12 21:30:32 v[3]     handler_input: id: 336215
2011.08.12 21:30:32 v[3]     handler: id: 336215 ip: XX.XX.XX.XX remote: 127.0.0.1:49242 uri: /query/xxx/yyy/
2011.08.12 21:30:32 [warn] ===    evhttp_write_buffer: fd: 142 preparing to write buffer
2011.08.12 21:30:32 v[3]     handler_output: id: 336215
2011.08.12 21:30:32 [warn] ===    event_active: 0x802a84508 (fd: 142), res 4, callback 0x800796ea0
2011.08.12 21:30:32 [warn] ===    evhttp_write_cb: fd: 142

There is 30 seconds difference between evhttp_get_request_connection and event_active calls. Why?
I wrote in my first message what tcpdump shows no troubles in network activity.
So, if everything ok with network, where libevent or maybe OS (FreeBSD 7.2) holds request for 30 / 75 seconds?
Should I insert debug output in some other important functions of libevent?

Any help is welcome.