NimbostratusHttp file download is 50% slower through f5 than direct to apache server
For a test we have isolated a setup in test with one 5120 one f5 3600 and one client machine running ab bench.
If the client machine runs ab bench to get a 1 GB arbitrary binary file (machines connected on gigabit extreme switch) the transfer rate is
Transfer rate: 112893.68 [Kbytes/sec] received
(Test 1 below)
If the client machine runs ab bench to get a 1 GB arbitrary binary file connects directly to the F5 and the f5 connects to the extreme switch which has the 5120 on it the speed is noticeably lower.
Transfer rate: 80984.89 [Kbytes/sec] received
(Test 2 below)
In the f5 it is a very simple setup that has one virtual server on port 80 with http profile that has one pool with one member that is the apache server machine listening on port 8080 ( so there is a PAT).
I have looked for anything that might be throttling but can't find anything and the CPU load is negligible.
Any ideas the discrepancy in speeds?
thanks in advance
Test 1
[loadgen@ca120lablg01 ~]$ ab -c 2 -n 2 http://10.77.199.145/firmware/196208_big_file.dat
This is ApacheBench, Version 2.0.40-dev <$Revision: 1.146 $> apache-2.0
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Copyright 2006 The Apache Software Foundation, http://www.apache.org/
Benchmarking 10.77.199.145 (be patient).....done
Server Software: Apache/2.2.14
Server Hostname: 10.77.199.145
Server Port: 80
Document Path: /firmware/196208_big_file.dat
Document Length: 1048576000 bytes
Concurrency Level: 2
Time taken for tests: 18.140962 seconds
Complete requests: 2
Failed requests: 0
Write errors: 0
Total transferred: 2097152530 bytes
HTML transferred: 2097152000 bytes
Requests per second: 0.11 [/sec] (mean)
Time per request: 18140.963 [ms] (mean)
Time per request: 9070.481 [ms] (mean, across all concurrent requests)
Transfer rate: 112893.68 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect: 1 5 5.7 9 9
Processing: 17847 17993 206.5 18139 18139
Waiting: 8 10 3.6 13 13
Total: 17856 17998 200.8 18140 18140
Percentage of the requests served within a certain time (ms)
50% 18140
66% 18140
75% 18140
80% 18140
90% 18140
95% 18140
98% 18140
99% 18140
100% 18140 (longest request)
Test 2
[loadgen@ca120lablg01 ~]$ ab -c 2 -n 2 http://192.168.128.33:8080/firmware/196208_big_file.dat
This is ApacheBench, Version 2.0.40-dev <$Revision: 1.146 $> apache-2.0
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Copyright 2006 The Apache Software Foundation, http://www.apache.org/
Benchmarking 192.168.128.33 (be patient).....done
Server Software: Apache/2.2.14
Server Hostname: 192.168.128.33
Server Port: 8080
Document Path: /firmware/196208_big_file.dat
Document Length: 1048576000 bytes
Concurrency Level: 2
Time taken for tests: 25.445323 seconds
Complete requests: 2
Failed requests: 0
Write errors: 0
Total transferred: 2097152530 bytes
HTML transferred: 2097152000 bytes
Requests per second: 0.08 [/sec] (mean)
Time per request: 25445.324 [ms] (mean)
Time per request: 12722.662 [ms] (mean, across all concurrent requests)
Transfer rate: 80486.30 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect: 13 13 0.0 13 13
Processing: 25122 25277 219.2 25432 25432
Waiting: 1 6 7.8 12 12
Total: 25135 25290 219.2 25445 25445
Percentage of the requests served within a certain time (ms)
50% 25445
66% 25445
75% 25445
80% 25445
90% 25445
95% 25445
98% 25445
99% 25445
100% 25445 (longest request)
