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Gary Kaiser

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Top Stories by Gary Kaiser

Can Wire Data Be APM? I recently read something – a blog, a tweet, a LinkedIn article perhaps – describing the use of wire data to analyze application performance. I remember that the author’s use of the term “APM” in this context caused one reader to comment, complaining that “you can’t call wire data APM.” This was around the same time I referred casually to Dynatrace’s wire data offering (Data Center Real User Monitoring, or DC RUM) as both “APM for IT Operations” and “probe-based APM.” So that complaint has stuck with me, prompting me to ask – and offer an answer to – the question. It depends, of course, on answers to related questions. How do you define APM? What role does APM play in your organization? What APM insights can wire data provide? Let’s take a brief look at each of these. What is APM to you? In very general terms (Wikipedia is great for this), APM ... (more)

Understanding Application Performance on the Network | Part 1

As a network professional, one of your newer roles is likely troubleshooting poor application performance. For most of us, our jobs have advanced beyond network "health," towards sharing - if not owning - responsibility for application delivery. There are many reasons for this more justifiable than the adage that the network is first to be blamed for performance problems. (Your application and system peers feel they are first to be blamed as well.) Two related influencing trends come to mind: Increased globalization, coupled with (in fact facilitated by) inexpensive bandwidth me... (more)

Understanding Application Performance on the Network | Part 3

In Part II, we discussed performance constraints caused by both bandwidth and congestion. Purposely omitted was a discussion about packet loss - which is often an inevitable result of heavy network congestion. I'll use this blog entry on TCP slow-start to introduce the Congestion Window (CWD), which is fundamental for Part IV's in-depth review of Packet Loss. TCP Slow-Start TCP uses a slow-start algorithm as it tries to understand the characteristics (bandwidth, latency, congestion) of the path supporting a new TCP connection. In most cases, TCP has no inherent understanding of th... (more)

Understanding Application Performance on the Network | Part 6

In Part V, we discussed processing delays caused by "slow" client and server nodes. In Part VI, we'll discuss the Nagle algorithm, a behavior that can have a devastating impact on performance and, in many ways, appear to be a processing delay. Common TCP ACK Timing Beyond being important for (reasonably) accurate packet flow diagrams, understanding "normal" TCP ACK timing can help in the effective diagnosis of certain types of performance problems. These include those introduced by the Nagle algorithm, which we will discuss here, and application windowing, to be discussed in Par... (more)

IT’s Little Secret: Too Little End-User Experience Data Use By @GKaiser | @DevOpsSummit #DevOps

IT's Little Secret: Too Little End-User Experience (EUE) Data Use Many of us are grappling with the modern demands of digital business: developing new mobile apps, evaluating security in the face of IoT, moving to hybrid clouds, testing approaches to defining networks through software. It's all part of the hard trend toward service-oriented IT, with a primary goal of delivering a premium end user experience (EUE) to all your users - internal, partners, and customers - with the speed, quality and agility the business demands. How do you meet these elevated expectations? As modern ... (more)