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Hardware Sizing Information

Hardware Sizing and Performance Information

Network Sizing Guidelines

The Genesys WebRTC implementation uses the G.711 and VP8 codecs:

  • The G.711 codec is used for audio and requires 64kbps of bandwidth in each direction (incoming and outgoing).
  • The VP8 codec is used for video encoding. The bitrate requirement depends on the quality of the streams, starting with a minimum of 100kbps and going up to 2000kbps or more for a single-party HD call. More detail is provided in the following table, which lists bandwidth requirements in kilobits per second.
Video Resolution Gateway Browser
Incoming Outgoing Incoming Outgoing
SD 256 256 128 128
HQ 512 512 256 256
ED 1024 1024 512 512
HD 2048 2048 1024 1024

Performance Testing Scenarios

Genesys performed load testing for the following hardware and software platforms to create the sizing guidelines for Genesys WebRTC Service 8.5.2.

VGA video resolution was used for this testing.
Performance Testing Configuration
Linux Virtual Machine Microsoft Windows Virtual Machine
OS Red Hat Linux Enterprise Server v6.3x86_64 Kernel 2.6.32-279 Windows Server 2008 R2 Enterprise x64
Processor Type Intel® Xeon® CPU X5675; 2 vCPUs; hyper-threading disabled Intel® Xeon® CPU X5675; 2 vCPUs; hyper-threading disabled
Speed 3.06 GHZ 3.06 GHZ
Memory Size (RAM) 5 GB 5 GB
Hard Disk Space 35 GB 35 GB
Genesys recommends Red Hat Enterprise Linux as the preferred platform for Genesys WebRTC Service.

Performance Test Results

Performance testing was conducted using VGA video resolution.

Due to a Windows memory leak and due to the fact that the Windows version of the Genesys WebRTC Service runs as a 32-bit process (running in compatibility mode for 64-bit Windows), most of the performance testing was done with Red Hat Enterprise Linux. Windows testing is still ongoing, so there are no conclusive test results at this time, but Genesys expects that your results with Windows should be slightly lower than the Linux results and recommends that you limit traffic to 110 simultaneous calls.
Linux Performance Test Results
Description Max Concurrent Calls CAPS
Browser-to-browser audio+video without Xcoding 120 1.65
Browser-to-browser audio without Xcoding 190 2.47
Browser-to-SIP endpoint audio+video with Xcoding 190 2.41
Browser-to-SIP endpoint audio with Xcoding 250 3.06
Browser-to-browser audio+video SRTP without Xcoding 120 1.65
Browser-to-SIP endpoint audio+video SRTP without Xcoding 140 1.85
Multiple instances of browser-to-browser audio+video without Xcoding

(Tested with 2 instances. Since larger configurations have not been tested,
Genesys recommends scaling horizontally by adding new hosts.)

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This page was last edited on March 24, 2017, at 13:04.
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