connection closed for event mpm? (Apache Users)

hi, guys

i have come across a problem related to event mpm in apache(v2.4.3), that is

connection may closed during transfer for some times. when i change to prefork mpm, everything goes well...

i also try to set EnableSendfile & EnableMMAP to Off, but without work...

following is the full Scenario of the problem..

wget -O a.flv http://video.test.com/a.flv; md5sum a.flv

--2013-03-27 18:15:51-- http://video.test.com/a.flv

Resolving video.test.com... 192.168.1.100

Connecting to video.test.com|192.168.1.100|:80... connected.

HTTP request sent, awaiting response... 200 OK

Length: 290899940 (277M) [video/x-flv]

Saving to: “a.flv”

19% [=======================> ] 56,424,265 2.50M/s in 16s

2013-03-27 18:16:07 (3.30 MB/s) - Connection closed at byte 56424265. Retrying.

--2013-03-27 18:16:08-- (try: 2) http://video.test.com/a.flv

Connecting to video.test.com|192.168.1.100|:80... connected.

HTTP request sent, awaiting response... 206 Partial Content

Length: 290899940 (277M), 234475675 (224M) remaining [video/x-flv]

Saving to: “a.flv”

19% [++++++++++++++++++++++++ ] 56,424,265 --.-K/s in 11s

2013-03-27 18:16:20 (0.00 B/s) - Connection closed at byte 56424265. Retrying.

--2013-03-27 18:16:22-- (try: 3) http://video.test.com/a.flv

Connecting to video.test.com|192.168.1.100|:80... connected.

HTTP request sent, awaiting response... 206 Partial Content

Length: 290899940 (277M), 234475675 (224M) remaining [video/x-flv]

Saving to: “a.flv”

100%[++++++++++++++++++++++++====================================================================================================>] 290,899,940 3.37M/s in 58s

2013-03-27 18:17:20 (3.86 MB/s) - “a.flv” saved [290899940/290899940]

671034be784ce6eb7bc9366572f5441f a.flv