Second run of ApacheBench against HelenOS websrv times out

[Jakub Jermář]

As of 75fcf9b27, running the testcase from #515 results in a timeout for the second run (make sure to start websrv in HelenOS before running this):

bash-4.4$ ab -c 4 -n 10 -t 30 -g results.out http://localhost:8080/index.html
This is ApacheBench, Version 2.3 <$Revision: 1807734 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/

Benchmarking localhost (be patient)
Finished 130 requests


Server Software:        
Server Hostname:        localhost
Server Port:            8080

Document Path:          /index.html
Document Length:        478 bytes

Concurrency Level:      4
Time taken for tests:   30.032 seconds
Complete requests:      130
Failed requests:        0
Total transferred:      64610 bytes
HTML transferred:       62140 bytes
Requests per second:    4.33 [#/sec] (mean)
Time per request:       924.057 [ms] (mean)
Time per request:       231.014 [ms] (mean, across all concurrent requests)
Transfer rate:          2.10 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    0   0.0      0       0
Processing:    68  921 784.7    777    2596
Waiting:       47  894 772.3    751    2550
Total:         68  921 784.6    777    2596

Percentage of the requests served within a certain time (ms)
  50%    777
  66%   1233
  75%   1589
  80%   1787
  90%   2079
  95%   2317
  98%   2519
  99%   2532
 100%   2596 (longest request)
bash-4.4$ ab -c 4 -n 10 -t 30 -g results.out http://localhost:8080/index.html
This is ApacheBench, Version 2.3 <$Revision: 1807734 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/

Benchmarking localhost (be patient)
apr_pollset_poll: The timeout specified has expired (70007)
Total of 116 requests completed

Even after the second run ends with the above error, top shows there is still some activity happening inside tcp.