Now, in some situations where Packet Loss is common, such as ADSL links, administrators may prefer to pump as much data as possible and flood the links even when packet loss is high.

Maybe I am being a little redundant here but I just want to make sure this is understood. The higher the Loss more bandwidth is throttled. PCoIP will start throttling sessions when Packet Loss is as low as 1%. In this situation PCoIP will not burst and fully utilise all the link bandwidth available. This happens dynamically because PCoIP is trying to auto preserve the end user experience making sure video and image displays are not affected by link issues.īecause multiple sessions share a same WAN link with regular Packet Loss all sessions may be throttling themselves. When PCoIP classify rto or Packet Loss as high the session is throttled. That brings me to the point I would like to raise in this article. In this case it was required to decrease the bandwidth several times because of packet loss.īased on these statistics PCoIP dynamically decide if bandwidth must be throttled however it will always attempt to increase it again if the conditions allow for, and if needed. The example below demonstrates the bandwidth being dynamically decreased (throttled) in a single PCoIP session. However, every couple milliseconds the endpoint device sends acknowledgements and provides statistics back to the PCoIP server ( aka virtual desktop). PCoIP is a UDP based protocol and maintain packet transmission without having to acknowledge (ACK) the reception of the UDP packet for every datagram received at the endpoint device. (T)ransmission is data flow from the virtual desktop to the end point device. In addition the rto metric PCoIP measures the amount of Packet Loss during Receiving and Transmitting period.

I have previously published the following articles: How to troubleshoot PCoIP performance and Optimising PCoIP Display & Imaging that will provide you with the base knowledge. When ‘ rto’ is close to 100 that’s when the link is in good conditions for a great user experience.Ĭouple examples of rto captured from log files are:īefore you continue reading this article I recommend you to get familiarised with PCoIP log files, troubleshooting and managing PCoIP display quality.

The higher the ‘ rto’ the worse is the user experience. These algorithms utilise arguments such as latency and variance to create what is called ‘ rto’ metric. PCoIP is a dynamic protocol and contains some very advanced mathematical algorithms to detect the ideal bandwidth, throughput, image quality and codecs to be utilised to stream contents to endpoints.

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