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The impact of Meltdown and Spectre patches on Windows 10

Meltdown and Spectre

Over the last weeks a lot has already been written about the supposedly high impact that the patches of both Meltdown and Spectre will have on the performance of computer systems but even experts do not yet agree how big the impact will be on centralized desktop environments such as Microsoft RDS, Citrix XenApp & XenDesktop and of course VMware Horizon causing a lot of Fear Uncertainty and Doubt.

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Don’t let your user-experience be a “Spectre” of itself after “Meltdown”

Bust your ghosts not your user experience

The names Spectre and Meltdown invoke feelings of dread in even the most seasoned IT engineer. To those uninitiated, let me get you up-to-speed quickly. Spectre is a vulnerability that takes advantage of “Intel Privilege Escalation and Speculative Execution”, and exposes user memory of an application to another malicious application. This can expose data such as passwords. Meltdown is a vulnerability that takes advantage of “Branch prediction and Speculative Execution”, and exposes kernel memory. A compromised server or client OS running virtualized could gain access to kernel memory of the host exposing all guest data. Both vulnerabilities take advantage of a 20-year-old method of increasing processor performance.

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The value of correct sizing in the Cloud

The Cloud is rising and the growth predictions are insane. Often we aren’t even aware when we are making use of the Cloud. Think about Hotmail, Office 365, Citrix Cloud or even websites like Airbnb. Not owning the servers, like Airbnb does with houses, but also with their website back-end, isn’t the only advantage of the Cloud. Other advantages are obvious: scalability, flexibility, disaster recovery, etc. But those advantages come at a cost. With a pay-per-user model like Office 365, the costs are evident. But if you go to an Infrastructure-as-a-Service (IaaS) model it can become confusing. Choosing the right amount of cloud resources is crucial to get the best value for money.

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Detect and avoid VDI performance problems

Building an integrated testing scenario to detect and avoid VDI performance problems

The company Login VSI sells a complete software solution to help digital workspace managers to optimize and safeguard the performance and availability of their virtual desktop production environments. Performance and availability are key dimensions of a good end-user experience and therefore very important for organizations with business-critical applications on VDI.

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Citrix Cloud on AWS

I was recently afforded the unique opportunity to collaborate on a project to test capacity out of a Citrix XenApp on AWS deployment. The goal of the project was to independently determine the maximum user density for a few different EC2 instance types running XenApp 7.14.

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The reason why your SBC or VDI users prefer their laptops

The reason why your SBC or VDI users prefer their laptops

Users are becoming more resource intensive when it comes to graphically rich media and you’ve seen it with many web applications, Microsoft PowerPoint, rich-media websites built with HTML 5, and even other business critical applications like radiology applications. These are all apps you’d expect to see at some point in a modern workspace, virtual or not.

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VDI Reference Architecture Monthly – December 2016

VDI Reference Architecture Monthly – December 2016

Happy new year and welcome to the first Reference Architecture Monthly of 2017. Sorry it has taken me a while to get this one out. We’ve been having fun at the end of year festivities while also preparing some really cool stuff for Login PI and Login VSI. There were two reference architectures posted in December by Dell EMC and Nutanix. While I always encourage you to grab these papers yourself and go through them thoroughly, I’ve also distilled them down to some of the cool bits that caught my attention. However, there can be much more to these papers, so please check them out if you are interested. Having our vendor community use Login VSI to show off their cool capabilities and top line performance is always a blast. So, let’s get crackin’…

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Fluctuation in VDI Test Results you can solve with Login VSI

Fluctuation in VDI Test Results with Login VSI

As a test engineer at Login VSI, I perform many tests each day. But to give some scientific value to these test results, I usually repeat these tests at least 10 times to make sure that there is not a lot of variance between tests with the exact same settings. Some of our customers seem to struggle with getting consistent results in their own environment and that’s why they frequently ask me “How is it possible to get a different result when repeating a Login VSI test with the same identical settings?” In this blog, I will explain the most common reasons why this is happening and I will share some best practices on how to solve this.

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