VSAP ab with nginx #
VSAP (VPP Stack Acceleration Project) 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) is used for measuring the maximum connections-per-second and requests-per-second.
NGINX 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 ]
- nginx attaches to VPP and listens on TCP port 80
- ab runs CPS and RPS tests with packets flowing from the Test Generator node, across 100G NICs, through VPP hoststack to NGINX.
- At the end of the tests, the results are reported by AB.