All posts by Ricardo Oliveira

The Evolution of Network Monitoring

Posted by on July 1, 2014

In the last 10 years we’ve seen a radical change in the way applications are delivered in enterprise environments. Workstations and desktops have been replaced with mobile devices such as phones and tablets or thin clients that connect to centralized VDI servers. On premise bare metal servers have been virtualized and consolidated, and applications that used to be on the… Read More »

Measuring Network Bandwidth Without Server Instrumentation

Posted by on January 14, 2014

Measuring network bandwidth is key to understanding network performance and performing capacity planning. Iperf, a traditional network testing tool, measures TCP throughput; but, this is not the same as available bandwidth (or capacity, for that matter). For instance, iperf results are highly dependent on the default TCP parameters of the kernel, among other caveats. But one of the main limitations… Read More »

Reality Check: A Survey of Cloud Providers for Top Sites

Type of Hosting for Top US Sites
Posted by on November 26, 2013

At ThousandEyes we deal with huge volumes of data collected from our agents across the Internet. A large number of our tests are configured to target public facing web sites owned by our customers. The performance of each site depends heavily on the provider hosting the site and how well it is connected to the Internet, especially for sites with a global footprint of users. … Read More »

Top 5 Prescriptions for Alert Fatigue

Solutions for monitoring alert fatigue
Posted by on November 5, 2013

Alert Fatigue is a common problem in monitoring systems, and happens whenever there’s an excess of alerts being triggered that are mostly false positives, i.e. noise. Finding a good balance of false negatives and false positives is somewhat an art rather than a science. In this article I will talk about some techniques to mitigate alert fatigue.… Read More »

Performance is not Speed

underlying performance problems iceberg
Posted by on August 29, 2013

Over the last few years, I’ve seen a lot of discussions and content online that equate the performance of an application with speed, most notably from the web performance and WPO (web performance optimization) communities. The corollary of this trend is to equate end user experience with the time it takes for a web page to load, aka RUM or real-user monitoring, but performance is not speed. … Read More »

Caveats of Popular Network Tools – Part I: Traceroute

ping traceroute comic
Posted by on July 2, 2013

There’s a set of tools that all network engineers are familiar with, and have been around for years, almost as long as the Internet itself in some cases. Yes, I’m talking about tools like traceroute, mtr, iperf and ping. These tools have been the bread and butter of network troubleshooting and can be very useful for simple tasks such as… Read More »