Tag - CPU

20-30% Performance Hit from the Spectre Bug Fix on Ubuntu

Spectre Bug Fix on Ubuntu

In this blog post, we’ll look at the performance hit from the Spectre bug fix on Ubuntu.
Recently we measured the performance penalty from the Meltdown fix on Ubuntu servers. It turned out to be negligible.
Today, Ubuntu made a Spectre bug fix on Ubuntu available, shipped in kernel 4.4.0-112. As with the Meltdown fix, we […]

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Meltdown and Spectre: CPU Security Vulnerabilities

CPU Security Vulnerabilities

In this blog post, we examine the recent revelations about CPU security vulnerabilities.
The beginning of the new year also brings to light fresh and new CPU security vulnerabilities. Today’s big offenders originate on the hardware side – more specifically, the CPU. The reported hardware kernel bugs allow for direct access to data held in the […]

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Troubleshooting hardware resource usage webinar: Q & A

Overlooked MySQL performance optimization

In this blog, I provide answers to the Q & A for the Troubleshooting hardware resource usage webinar.
First, I want to thank everybody who attended the May 26 webinar. The recording and slides for the webinar are available here. Below is the list of your questions that I wasn’t able to answer during the webinar, […]

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Hyper-threading -How does it double CPU throughput?

Hyper-threading

The other day a customer asked me to do capacity planning for their web server farm. I was looking at the CPU graph for one of the web servers that had Hyper-threading switched ON and thought to myself: “This must be quite a misleading graph – it shows 30% CPU usage. It can’t really […]

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