Hello! On Wed, Apr 16, 2014 at 10:30:24AM -0400, Shrirang wrote:
> I am using "ngx_http_limit_req" module. After going through the code I see > that if "burst = 0" (i.e. not specified) then maximum rate limiting that can > be offered is 1000 RPS only. I have seen this in my stress test too. > I didn't see this in any documentation. Want to clarify if this is really > true or I missed something? > > --- > Reasoning : > 1. Module expects uniform request arrival. Any request that breaks the > uniformity, will get rate limited. > 2. Configured rate = 1000r/s. This means 1 request-per-ms. > 3. If more than 1 request is received in same "ms" time, then only 1 request > is served. All other requests are rate limited. > 4. For above configuration, if "burst=X" is configured, then "X" number of > requests are served while requests more than that will get rate limited. > 5. If Configured rate = 2000r/s (i.e. 2 request-per-ms). If "burst=0" (i.e. > not specified), then too it supports only 1-request-per-ms rate. If 3 > requests are received in same "ms" then only 1 is served and other 2 are > rate limited. Yes, the module uses time with millisecond resolution, and hence rates higher than 1 request per millisecond won't work without burst specified. -- Maxim Dounin http://nginx.org/ _______________________________________________ nginx mailing list [email protected] http://mailman.nginx.org/mailman/listinfo/nginx
