Lab Setup

Test Setup to Generate Simulated Traffic

Overview

The lab is currently hosted in SUSE Taipei office, where the setup consists of 2 workstations (david and benjamin), both installed with network interface card Intel Corporation Ethernet Server Adapter X520-2 [8086:000c] (the SFP+ module is from Finisar), and connected directly with optical fiber. The subnet used is 192.168.2.0/24, where benjamin is 192.168.2.1 and david is 192.168.2.2.

benjamin is the traffic generating machine, on which we run TREX, the traffic generator. david is the machine under test, on which we run Nginx to serve HTTP traffic, simulating a real-work server.

Setting up david

Install Nginx with sudo zypper install -y nginx

Follow TREX's guide on Nginx Tuning to increase the maximum number of file descriptors allow, then restart Nginx with sudo systemctl restart nginx.

Since TREX cannot handle ARP request to resolve IPs used by benjamin, we need to manually setup static mapping to IP to MAC address so david won't send out ARP requests.

$ for i in $(seq 3 254); do sudo ip neigh add 192.168.2.$i lladdr 00:1b:21:3c:9e:2c dev ixgbe1; done

david also suppose to run Phoeβe . Follow BUILDING.md for build it and README.md#Running how to execute it.

Setting up benjamin

Install the latest TREX from archive at https://trex-tgn.cisco.com/trex/release/latest

Write the following TREX configuration into /etc/trex_cfg.yaml.

- port_limit      : 2
  version         : 2
  low_end: true
#List of interfaces. Change to suit your setup. Use ./dpdk_setup_ports.py -s to see available options
  #interfaces    : ["ixgbe1","dummy"]
  interfaces    : ["0000:04:00.1","dummy"]
  port_info       :  # Port IPs. Change to suit your needs. In case of loopback, you can leave as is.
          - src_mac: 00:1b:21:3c:9e:2c
            dest_mac: 00:1b:21:3c:9e:31
          - src_mac: 00:1b:21:3c:9e:31
            dest_mac: 00:1b:21:3c:9e:2c

Modify nginx_wget.py so the 192.168.2.0/24 subnet is used, and rename it to nginx_wget_local.py.

--- astf/nginx_wget.py
+++ astf/nginx_wget_local.py
@@ -4,8 +4,8 @@
 class Prof1():
     def get_profile(self, **kwargs):
         # ip generator
-        ip_gen_c = ASTFIPGenDist(ip_range = ["16.0.0.1", "16.0.0.200"], distribution="seq")
-        ip_gen_s = ASTFIPGenDist(ip_range = ["48.0.0.1", "48.0.0.200"], distribution="seq")
+        ip_gen_c = ASTFIPGenDist(ip_range = ["192.168.2.3", "192.168.2.253"], distribution="seq",)
+        ip_gen_s = ASTFIPGenDist(ip_range = ["192.168.2.2", "192.168.2.2"], distribution="seq")
         ip_gen = ASTFIPGen(glob = ASTFIPGenGlobal(ip_offset="1.0.0.0"),
                            dist_client = ip_gen_c,
                            dist_server = ip_gen_s)

Then start the traffic generator with the following command. $multiplier is the flow multiplier, this corresponds to the number of HTTP request that will be sent per second, and $duration is how long the test should last, which in turn affect the total number of requests that will be sent (total requests = $multiplier * $duration).

$ cd /opt/trex/v2.79
$ sudo ./t-rex-64 -f astf/nginx_wget_local.py --astf --astf-client-mask 0x1 -m $multiplier -d $duration --nc