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[csit.git] / docs / content / methodology / hoststack_testing / vsap_ab_with_nginx.md

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----
-title: "VSAP ab with nginx"
-weight: 4
----
-
-# VSAP ab with nginx
-
-[VSAP (VPP Stack Acceleration Project)](https://wiki.fd.io/view/VSAP)
-aims to establish an industry user space application ecosystem based on
-the VPP hoststack.  As a pre-requisite to adapting open source applications
-using VPP Communications Library to accelerate performance, the VSAP team
-has introduced baseline tests utilizing the LD_PRELOAD mechanism to capture
-baseline performance data.
-
-[AB (Apache HTTP server benchmarking tool)](https://httpd.apache.org/docs/2.4/programs/ab.html)
-is used for measuring the maximum connections-per-second and requests-per-second.
-
-[NGINX](https://www.nginx.com) is a popular open source HTTP server
-application.  Because NGINX utilizes the POSIX socket interface APIs, the test
-configuration uses the LD_PRELOAD mechanism to connect NGINX to the VPP
-Hoststack using the VPP Communications Library (VCL) LD_PRELOAD library
-(libvcl_ldpreload.so).
-
-In the future, a version of NGINX which has been modified to
-directly use the VCL application APIs will be added to determine the
-difference in performance of 'VCL Native' applications versus utilizing
-LD_PRELOAD which inherently has more overhead and other limitations.
-
-The test configuration is as follows:
-
-           TG     Network         DUT
-         [ AB ]=============[ VPP -> nginx ]
-
-where,
-
-1. nginx attaches to VPP and listens on TCP port 80
-2. ab runs CPS and RPS tests with packets flowing from the Test Generator node,
-   across 100G NICs, through VPP hoststack to NGINX.
-3. At the end of the tests, the results are reported by AB.