performance

[feles]

hi,
when I try to make a performance test with ab server gives an error I use an index file of 8MB sized, the error is below, anybody here knows with which configuration can I overcome this error.

[root@ns lws]# /home/w2/bin/ab -n 10000 -c 50 -k http://192.168.75.128:8088/
This is ApacheBench, Version 2.0.40-dev <$Revision: 1.121.2.8 $> apache-2.0
Copyright (c) 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Copyright (c) 1998-2002 The Apache Software Foundation, http://www.apache.org/

Benchmarking 192.168.75.128 (be patient)
Send request timed out!
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Server Software: LiteSpeed
Server Hostname: 192.168.75.128
Server Port: 8088

Document Path: /
Document Length: 8521775 bytes

Concurrency Level: 50
Time taken for tests: 608.265587 seconds
Complete requests: 10000
Failed requests: 950
(Connect: 0, Length: 950, Exceptions: 0)
Write errors: 0
Keep-Alive requests: 9100
Total transferred: 240997972 bytes
HTML transferred: 238741172 bytes