Re: Poor Load Balancer performance (Apache Users)

Oh shit! copy/paste error!!!

I has inverted the results! I'm sorry!

the real ones...

Results when I run 'ab -k -n 10000 -c 1000 http://vm_host_ip_address:8010/' with NO balancer configured...
Finished 10000 requests
Server Software: Apache/2.4.41
Server Hostname: 192.168.68.210
Server Port: 8010
Document Path: /
Document Length: 97098 bytes
Concurrency Level: 1000
Time taken for tests: 15.527 seconds
Complete requests: 10000
Failed requests: 834
(Connect: 0, Receive: 0, Length: 834, Exceptions: 0)
Keep-Alive requests: 9166
Total transferred: 892851836 bytes
HTML transferred: 890000268 bytes
Requests per second: 644.04 [#/sec] (mean)
Time per request: 1552.701 [ms] (mean)
Time per request: 1.553 [ms] (mean, across all concurrent requests)
Transfer rate: 56155.42 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect: 0 22 146.6 0 1038
Processing: 0 657 1668.1 122 13453
Waiting: 0 752 1883.8 121 13453
Total: 0 679 1763.1 122 14476
Percentage of the requests served within a certain time (ms)
50% 122
66% 234
75% 330
80% 402
90% 1657
95% 4987
98% 7221
99% 8733
100% 14476 (longest request)
Finished 10000 requests

Results when I run 'ab -k -n 10000 -c 1000 http://vm_host_ip_address:8010/' with (YES) balancer...

Finished 10000 requests

Server Software: Apache/2.4.41
Server Hostname: 192.168.68.210
Server Port: 8010
Document Path: /
Document Length: 97098 bytes
Concurrency Level: 1000
Time taken for tests: 24.029 seconds
Complete requests: 10000
Failed requests: 5526
(Connect: 0, Receive: 0, Length: 5526, Exceptions: 0)
Keep-Alive requests: 8938
Total transferred: 870844342 bytes
HTML transferred: 868062523 bytes
Requests per second: 416.16 [#/sec] (mean)
Time per request: 2402.908 [ms] (mean)
Time per request: 2.403 [ms] (mean, across all concurrent requests)
Transfer rate: 35391.87 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect: 0 22 144.2 0 1039
Processing: 0 1087 2291.1 451 18504
Waiting: 0 1207 2615.1 426 18470
Total: 0 1109 2372.3 451 19514
Percentage of the requests served within a certain time (ms)
50% 451
66% 585
75% 678
80% 764
90% 1868
95% 7315
98% 10098
99% 11156
100% 19514 (longest request)
Finished 10000 requests

Missatge de Eric Covener <covener@xxxxxxxxx> del dia dj., 27 de maig 2021 a les 12:51:

On Thu, May 27, 2021 at 6:22 AM Marc Serra <mserra@xxxxxxxxx> wrote:
I got better performance without the load balancer.

Results when I run 'ab -k -n 10000 -c 1000 http://vm_host_ip_address:8010/' with no balancer...
Requests per second: 416.16 [#/sec] (mean)
Transfer rate: 35391.87 [Kbytes/sec] received

Results when I run 'ab -k -n 10000 -c 1000 http://vm_host_ip_address:8010/' with balancer configured...
Requests per second: 644.04 [#/sec] (mean)
Transfer rate: 56155.42 [Kbytes/sec] received

It doesn't look like the no-proxy case did better. Which metric were you looking at?

+ a few cautions:
- If you aren't taxing the system beyond what a single backend could handle, it can easily be slower by adding a proxy.
- A layer 7 proxy can easily be more overhead than a basic VIP / LB / IP sprayer if there's nothing actually being offloaded in the proxy.

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