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Re: [users@httpd] mod_ratelimit working by steps ?




2018-04-22 21:15 GMT+02:00 <nerbrume@xxxxxxx>:
Hi,

I created a 4MB file and rate limited its directory container in the
httpd's conf, and tested 8/20/30/etc.. settings as you suggested with
curl:

curl http://localhost/test.txt > /dev/null (in this way I drop the
returned response but keep the curl's connection metadata summary).

In every case I get the expected result (average Dload speed).

Thanks a bunch for testing this, and confirming that something is wrong on my side.
After more test, I'm pretty sure the problem come from a bad interaction between mod_ratelimit and mod_proxy.
(sorry, I forgot to mention that the path I was trying to rate-limit is indeed a tomcat app behind mod_proxy).

Did you execute your performance tests in localhost? And also, did you
use another tool other than Firefox? I'd be curious to know your
results with curl executed in localhost.

I've tried the following (Excerpts from my config at the end of this mail):

0) rate-limit on tomcat app proxified throught mod_proxy (previous mail)
   => rate-limit works by step, and does not limit anything if rate-limit > 40
   (tried on local with wget)
1) rate-limit on a true folder, served by apache :
   => rate-limit is working as expected
2) rate-limit on file served through python's SimpleHttpServer, proxified by mod_proxy
   => rate-limit works by step.

In conclusion, tomcat is not at fault, since python's SimpleHttpServer also have a problem, and the trouble come from my reverse-proxy.
In the case af a reverse proxy, I'm not sure which part of the connection get rate-limited ?
Is that an known problem ?
Or am I trying to do something totally bogus here ?
Any ideas to achieve my goal ? (that is, limiting the bandwith used by the tomcat app)


I opened a tracking task in https://bz.apache.org/bugzilla/show_bug.cgi?id=62362, I tried to write in there an explanation about what I think it is happening.

Thanks for the report!

Luca