The performance was the key to everything we're trying to optimize and issue of NetScaler. Many years and several versions, we are optimizing the distribution of applications in XenApp and XenDesktop environments. ICA protocol is the key and we understand the CIA to optimize the flow. ICA operates over TCP and for most working protocols over TCP, much value can be delivered by understanding the protocol behavior and therefore to optimize the TCP layer.
to the NetScaler TCP optimization layer that is controlled by TCP profiles. TCP profiles are rich in features for optimizing and accelerating perspective and carries a lot of value. The most exciting part about TCP profiles is the flexibility to use with a standard TCP based on NetScaler. The same NetScaler we can use different TCP congestion avoidance algorithms for different parameters like vservers, services, etc. When we talk about the CIA and the core components of XenApp / XenDesktop, NetScaler is important load balancing perspective and each terminal, now we can use the specific TCP profile to optimize and accelerate the flow.
it is interesting with NetScaler 10 GA build 69.4, we added integrated TCP profile environmental XenApp / XenDesktop and flow based ICA protocol. This makes it very exciting that you do not need to be an expert TCP and ICA to define a profile that can provide the best performance for XenApp and XenDesktop deployments. Here is an overview of the parameters set for this TCP profile.
As you can see the profile is defined keeping in mind the small packets and talkative scenarios VDI environments. The settings set to the optimum value based on our experience working with such deployments over many years. For example, we want to ensure that you can send more packets per MSS because the ICA flow can be really small packages. For network busy with more drops and retransmissions that you want to ensure that as the number of packets can be sent by retransmission. The minimum period of retransmission value is significantly reduced so that there is less waiting time for subsequent retransmissions. Scaling of the window and selective Accused are enabled for this profile for a better experience on long pipes. The Nagle algorithm is enabled given the small package scenario. Overall each parameter is studied and optimally tuned for XenApp and XenDesktop deployments to give you the best experience.
Please refer to the following blog if you want to understand the parameters in detail.
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