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 cant really be [&]

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http://www.percona.com/blog/2015/01/15/hyper-threading-double-cpu-throughput/