limit issue, i think it's a bug

[Stefan Caunter]

On Sat, Nov 26, 2011 at 5:03 AM, talisto <nginx-forum at nginx.us> wrote:
> I realize this is a two-year-old topic, but I'm having the same issue.
> It doesn't matter what I have the rate set to, it only allows about 2
> requests per second.  This is my config:
>
> in http:
> limit_req_zone $binary_remote_addr zone=flood:10m rate=15r/s;
>
> in server location:
> limit_req zone=flood;
>
> That should really be all that is necessary, right?  I'm using Nginx
> 1.1.6.
>

> Maxim Dounin Wrote:
> How do you test it?

> I've been testing it with Siege, but I can actually generate error 503
> responses just by refreshing my web browser fast enough.  My results
> with Siege are somewhat random; sometimes the very first request fails,
> then a couple will pass, then another will fail, all within a couple
> seconds.  That's with my rate set to 15r/s, which should be more than
> enough.. in Siege I'm only using 5 concurrent users with 1 request per
> second, yet it still fails, often on the first or second hit.  In my
> browser, it's a bit more reliable;  I have a simple page which makes 2
> ajax requests; the 2nd ajax request will always fail.

> As soon as I remove the limit_req line, I can flood my server with as
> many requests as Siege can handle and it never generates a 503, so I
> know that the errors aren't being caused by something else.  I'm not
> sure why the limit_req isn't working properly though.

You are truncating your response. Don't top post or do that, it makes
it difficult to track things or for us to help you.

>From a review of the documentation this is by design.
Siege with 5 concurrent users at 1r/s could easily exceed 15r/s if
there is other traffic or if it is not behaving predictably.
Are you sure there are no other requests to the site, and that the
browser test only makes 2 requests, and that siege only sends 10
requests? We need logs.
>From what you have sent, you will get 503 because you are limiting the
requests and have not defined burst. Set burst to nodelay and see if
it allows 15/s.
And you cannot claim bug without evidence; please see the DEBUG
README, show relevant configuration, define limit_req_log_level
correctly, and send the output.


Stefan Caunter
http://scaleengine.com/contact
"People who enjoy having meetings should never be allowed to be in
charge of anything."