Connections without Onload

HTTP Connections with nginx

Run the nginx application on system-2, increasing the number of file descriptors available:

[system-2]# ulimit -n 1000000 && nginx

Run multiple instances of the wrk application on system-1, so there is the capacity to generate more connection requests than can be handled. A zero-byte file is requested, and the “Connection: close” header is passed to close the connection immediately:

[system-1]# for i in {1..3}; do taskset -c $i wrk -t 1 -c 50 -d 10s
-H 'Connection: close' http://system-2/0kb.bin & done

Each instance outputs its own results. Aggregating the results gives the following totals:

Requests/sec: 34431.98
Transfer/sec:        8.02MB

The server handles only 34431 connections per second (Requests/sec). This rate is greatly reduced compared to that achieved with Onload (see Connections with Onload above).